Temporal and Spatial Dynamics of Anthracnose (Colletotrichum sublineolum) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia

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About 10% of the daily caloric intake of households in Ethiopia’s northwest and eastern regions, including Benishangul Gumuz, comes from sorghum. A hemi-biotrophic fungal pathogen called Colletotrichum sublineolum caused anthracnose disease is among the biotic constraints of sorghum production. Methods Ten selected sorghum genotypes were assessed for sorghum anthracnose severity and its temporal and spatial dynamics on field plots in the districts of Assosa and Bambasi. The performance of the chosen sorghum genotypes was assessed using the following metrics: AUDPC, disease progress rate, yield-related trait, sorghum grain yield, and mean severity index. Anthracnose severity was evaluated using a 1–5 disease rating scale and assessments conducted at seven consecutive time points. Results The result found that the mean anthracnose severity index ranging from 60-77 PSI and 53-82 PSI, respectively. AUDPC varied from 351 to 470 % days and 316 to 499 % days at Assosa and Bambasi districts, respectively. Bambasi district achieved a larger grain yield than the Assosa district. Assosa-1 demonstrated a significant level of disease pressure, yet the current investigation found that this genotype is the highest performing genotype in both locations. Conclusions There is a considerable positive link between the severity of anthracnose and the weekly total rainfall and relative humidity. At both trial sites, Mersa-1 continuously produced higher grain yields and reduced disease levels. Breeders might utilize the Baco Striga sorghum genotype as a check line in a breeding effort to resist anthracnose disease because it shown a high vulnerability to the disease at both locations. 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F1000Research 2025, 13 :1290 ( https://doi.org/10.12688/f1000research.156145.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Research Article Revised Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] Binyam Tsedaley https://orcid.org/0000-0002-2369-3116 1 , Kumlachew Alemu https://orcid.org/0000-0002-3940-012X 1 Binyam Tsedaley https://orcid.org/0000-0002-2369-3116 1 , Kumlachew Alemu https://orcid.org/0000-0002-3940-012X 1 PUBLISHED 17 Mar 2025 Author details Author details 1 College of Agriculture and Natural Resource, Assosa University, Assosa, NA, NA, Ethiopia Binyam Tsedaley Roles: Conceptualization, Data Curation, Funding Acquisition, Investigation, Methodology, Writing – Original Draft Preparation Kumlachew Alemu Roles: Formal Analysis, Investigation, Methodology, Supervision, Writing – Review & Editing OPEN PEER REVIEW DETAILS REVIEWER STATUS This article is included in the Agriculture, Food and Nutrition gateway. This article is included in the Pathogens gateway. Abstract Background Over 500 million people worldwide rely on sorghum as a main food crop. About 10% of the daily caloric intake of households in Ethiopia’s northwest and eastern regions, including Benishangul Gumuz, comes from sorghum. A hemi-biotrophic fungal pathogen called Colletotrichum sublineolum caused anthracnose disease is among the biotic constraints of sorghum production. Methods Ten selected sorghum genotypes were assessed for sorghum anthracnose severity and its temporal and spatial dynamics on field plots in the districts of Assosa and Bambasi. The performance of the chosen sorghum genotypes was assessed using the following metrics: AUDPC, disease progress rate, yield-related trait, sorghum grain yield, and mean severity index. Anthracnose severity was evaluated using a 1–5 disease rating scale and assessments conducted at seven consecutive time points. Results The result found that the mean anthracnose severity index ranging from 60-77 PSI and 53-82 PSI, respectively. AUDPC varied from 351 to 470 % days and 316 to 499 % days at Assosa and Bambasi districts, respectively. Bambasi district achieved a larger grain yield than the Assosa district. Assosa-1 demonstrated a significant level of disease pressure, yet the current investigation found that this genotype is the highest performing genotype in both locations. Conclusions There is a considerable positive link between the severity of anthracnose and the weekly total rainfall and relative humidity. At both trial sites, Mersa-1 continuously produced higher grain yields and reduced disease levels. Breeders might utilize the Baco Striga sorghum genotype as a check line in a breeding effort to resist anthracnose disease because it shown a high vulnerability to the disease at both locations. READ ALL READ LESS Keywords Assosa, Bambasi, C. sublineolum, Disease progress rate, Sorghum, Weather variables Corresponding Author(s) Binyam Tsedaley ( [email protected] ) Close Corresponding author: Binyam Tsedaley Competing interests: No competing interests were disclosed. Grant information: The research was funded by Assosa University, grant number: ASU/RD/2019 The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2025 Tsedaley B and Alemu K. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. How to cite: Tsedaley B and Alemu K. Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.12688/f1000research.156145.2 ) First published: 28 Oct 2024, 13 :1290 ( https://doi.org/10.12688/f1000research.156145.1 ) Latest published: 17 Mar 2025, 13 :1290 ( https://doi.org/10.12688/f1000research.156145.2 ) Revised Amendments from Version 1 In this updated version, we have made several revisions to enhance the clarity, accuracy, and completeness of our work. The key changes are as follows: Data: We have incorporated additional data (Table 1) points and improved data presentation to strengthen our conclusions. Text: Several sections of the main text have been revised for clarity and precision, particularly in [ Sorghum genotypes' agronomic characteristics, Components of sorghum genotypes related to yield and Sorghum genotypes' grain yields ]. Since we add one Table the number of all Tables is changed These changes were made to address reviewer feedback, ensure consistency, and improve the overall readability and impact of our manuscript. In this updated version, we have made several revisions to enhance the clarity, accuracy, and completeness of our work. The key changes are as follows: Data: We have incorporated additional data (Table 1) points and improved data presentation to strengthen our conclusions. Text: Several sections of the main text have been revised for clarity and precision, particularly in [ Sorghum genotypes' agronomic characteristics, Components of sorghum genotypes related to yield and Sorghum genotypes' grain yields ]. Since we add one Table the number of all Tables is changed These changes were made to address reviewer feedback, ensure consistency, and improve the overall readability and impact of our manuscript. See the authors' detailed response to the review by Ararsa Leta READ REVIEWER RESPONSES Introduction Sorghum ( Sorghum bicolor L. Moench) is a tropical plant belonging to the Poacaea family originated in northeast Africa ( Pedersen et al. 2003 ). Due to the highest genetic diversity found in the nation for both cultivated and wild varieties, Ethiopia is frequently recognized as the center origin and diversity of sorghum domestication ( Fetene et al. 2011 ). After maize, rice, wheat, and barley, sorghum is the fifth most important cereal crop in the world ( FAO 2021 ). Sorghum, which is grown yearly on over 1.8 million hectares of land and contributes 4.3 million t to Ethiopia’s annual grain production, is the third most important cereal crop in the country after maize and teff ( CSA 2017 ). According to Upadhyaya et al. (2013) , sorghum is a crop with several uses, since humans can consume its grains, and its stalks may be utilized to make juice, animal feeds, and construction. Ethiopians typically use sorghum to make injera, which is a traditional bread ( Wortmann et al. 2009 ). Over 500 million people worldwide, residing in over 30 nations, rely on sorghum as a staple food ( Smith and Frederiksen 2000 ). About 10% of the daily caloric intake of households in Ethiopia’s northwest and eastern regions, including Benishangul Gumuz, comes from sorghum ( USAID 2012 ). It is also known to withstand hostile environmental circumstances. However, both biotic and abiotic constraints negatively affect its production. A hemi-biotrophic fungal pathogen called Colletotrichum sublineolum caused anthracnose disease is among the biotic constraints of sorghum production. It limits grain production and quality in most sorghum growing areas in the world, including Ethiopia ( Chala et al. 2007 ; Tsedaley et al. 2016 , 2021 and 2023 ). Since its discovery in 1902 in Togo, West Africa ( Sutton, 1980 ), anthracnose disease on sorghum has been documented in most places where the crop may be successfully farmed worldwide ( Pastor-Corrales and Frederiksen 1980 ; Thakur and Mathur 2000 ). In tropical areas where high temperatures and humidity promote C. sublineolum development, propagule dissemination, and sporulation, this disease is associated with significant sorghum yield losses ( Pastor-Corrales and Frederiksen 1980 ). Serious epidemics at farmers’ and research fields occur when the crop reaches its flowering stage, which is a condition that many local land races and improved varieties are susceptible at this stage ( Thomas 1995 ). One of the most severe diseases affecting sorghum output globally is anthracnose, which is particularly problematic in warm, humid climates ( Thakur 2007 ; Upadhyaya et al. 2013 ). The fungus can infect any of the plant’s aerial parts, including the panicle, stalk, foliage, and grain. Although foliar infection is the most dangerous, it can affect the quality of both the grain and the stalk ( Upadhyaya et al. 2013 ). Damage from sorghum anthracnose might include foliar damage, stalk rot, peduncle breakage, and grain degeneration ( Pastor-Corrales and Frederiksen 1980 ). According to Ngugi et al. (2000) , C. sublineolum epidemics were consistently associated with greater disease levels by the milk stage (v95) and higher final disease levels at crop senescence. In susceptible types, the disease can also result in grain yield losses ranging from 47 to 67% ( Pande et al. 2003 ; Gwary and Asala 2006 ); the loss of stalk is less severe, at 23% ( Pande et al. 2003 ). According to reports from eastern Ethiopia, the disease can cause grain yield losses of between 26 and 35% on vulnerable sorghum genotypes ( Girma et al. 2009 ). Farmers with limited resources are not advised to employ fungicide as a disease management strategy for anthracnose due to the financial benefits ( Marley et al. 2004 ). Biological control with the use of antagonistic organisms such as Trichoderma species, Pseudomonas syringae and Pseudomonas chlororaphis have been extensively used by various researchers across the globe due to their characteristics such as fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, production of antibiosis ( Khan et al. 2018 ; Sharma et al. 2019 ). The primary approach to managing this disease has been genetic resistance; however, due to the great degree of heterogeneity in the pathogen population, host-specific resistance is frequently unstable ( Ali et al. 1987 ; Bressan and Figueiredo 2003 ). Sorghum anthracnose disease can be effectively controlled with resistant cultivars. However, because the pathogen population is highly variable and novel pathotypes have the ability to overcome existing sources of resistance, numerous sources of resistance are required ( Cardwell et al. 1989 ; Valerio et al. 2005 ). Because, C. sublineolum is highly changeable and the environment has a significant impact on the development of symptoms and the transmission of the disease, breeding for stable host plant resistance has proven challenging, especially in areas where anthracnose is prevalent. The underlying mechanisms of anthracnose resistance remain poorly understood, despite the fact that many sources of genetic resistance are identified ( Tesso et al. 2012 ). Ethiopian sorghum germplasm may have genetic diversity for anthracnose resistance breading, and it has proven to be a useful source of genetic variation for the creation of grain sorghum breeding lines in the United States ( Erpelding 2009 ). Sorghum anthracnose is a global sorghum disease that is common anywhere sorghum is grown. It is frequently seen in farmer’s fields in Ethiopia’s main sorghum-growing regions ( Tsedaley et al. 2016 ). In the western portion of the nation, the majority of native land races, including enhanced sorghum genotypes, are vulnerable to this disease. Sorghum anthracnose is a serious disease in the Assosa zone, especially in the districts of Assosa, Bambasi, and Homesha, according to Tsedaley et al. (2016) . Furthermore, the majority of the farmers in that region constantly inquired about increasing the genotype of high-yielding, disease-tolerant sorghum varieties. In the meanwhile, not much study has been done to assess how different sorghum genotypes respond to the anthracnose disease in Benshangul Gumuz, Western Ethiopia. Consequently, the goal of this study was to evaluate the temporal and spatial dynamics of the anthracnose ( Colletotrichum sublineolum ) disease on several genotypes of sorghum in the Assosa zone of Western Ethiopia. Methods Explanation of the research areas During the 2020 main cropping season, field experiments were conducted at two locations, referred to as Assosa district (Assosa University research field) and Bambasi district, to assess how different sorghum genotypes responded to specific disease variations and how they adapted to different agro-ecological zones of the study areas. At a height of 1462 meters above sea level, the Bambasi district experimental site is situated at 9°9′N longitude and 34°66′E latitude. On the other hand, the Assosa district experimental site is situated at an elevation of 1600 meters above sea level and at 34°59′E longitude and 10°10′N latitude ( Tsedaley et al. 2016 ). Situated in the semi-arid tropical belts of Western Ethiopia, the experimental sites exhibit humid climate conditions. Materials for the experiments, preparation of the land, experimental units, and design Materials for the experiments In the Assosa and Bambasi districts during the main cropping season of 2020, the response of ten sorghum genotypes ( Table 1 ), with varying degrees of resistance to sorghum anthracnose were assessed. Table 1. Sorghum varieties with their crop passport. S.N Variety name Pedigree name Year of release Disease reaction Altitude Yield (q/ha) Seed source Research center Farmers field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Preparation of the Land In each trial location, the grounds were prepped by plowing twice. DAP and urea fertilizers were applied at recommended rates of 100 kg ha -1 ( Mekbib 2006 ). DAP was applied at the time of the sowing, and urea was added when the sorghum plants were knee-high (0.50 m). Following seed emergence, cultivation and weed management are done three times ( Tsedaley et al. 2023 ). Experimental units and design Ten sorghum genotypes that were evaluated in the 2020 cropping season in the districts of Assosa and Bambasi served as the experimental units. In each experimental site, the trials were set up in a randomized complete block design (RCBD) with three replications. According to Tsedaley et al. (2023) , the trials were carried out in naturally infected fields without the use of artificial inoculants. Plots and blocks were separated by 1.5 and 1 meters, respectively. There were five rows and 2 m × 3.75 m (7.5 m 2 ) area in each allotment. Inter-row spacing of 0.75 m and intra-row spacing of 0.20 m were used according to Mekbib (2006) . Ten sorghum plants per row and fifty plants total were cultivated in each plot. In the districts of Bambasi and Assosa, sowing took place on June 10 and June 11, respectively. Twenty-one days after seeding, plants were trimmed to one plant per hill from two seeds each ( Chala et al. 2010a ). Data gathering Evaluation of Sorghum Anthracnose Disease Severity Ten randomly chosen and pre-tagged plants in the middle three rows were used to measure the percentage of their leaf area that was impacted by the anthracnose disease. According to this study, the disease started to manifest in the first week of September in the cropping season of 2020 in both the Assosa and Bambasi areas. Beginning 12 weeks (85 days) following each location’s seeding, the severity of the anthracnose disease was rated at intervals of seven days for seven consecutive time points. It began when the Baco Striga and BTx623 (universally susceptible) sorghum genotypes at both sites began to exhibit definite disease symptoms. It was evaluated using the Thakur et al. (2007) recommended 1–5 disease rating scale. For analytical purposes, the sorghum anthracnose severity grade was transformed into a percent severity index (PSI) using the Wheeler (1969) formula: PSI = Snr Npr × Mss × 100 where Mss is the maximum disease scale, Npr is the number of plants assessed, and Snr is the sum of numerical ratings. In order to compute disease progress rates (r), one must use the linearized logistic model ( Van der Plank 1963 ) and evaluate the resultant number using SAS software. r = ( ln X 1 − X ) − ( ln X o 1 − X 0 ) t Where t is the length of the epidemic, r is the disease progression rate, Xo is the starting disease severity, X is the end disease severity, and ln is the natural logarithm. The percent severity index (PSI) data was used to determine the area under the disease progress curve (AUDPC), which is done using the technique suggested by Shaner and Finney in 1977 . AUDPC = ∑ i = 1 n − 1 [ ( X i + X i + 1 ) 2 ] ( t i + 1 − t 1 ) Where n is the total number of disease assessments, t i is the period in days since the initial assessment date, and Xi is the percentage of leaf area covered by anthracnose at the i th observation. Sorghum agronomic data, yield, and yield-related characteristics Performance in terms of plant height, panicle length, 1000-seed weight (TSW), and grain yield was also assessed for sorghum genotypes. Ten randomly chosen and tagged plants in the middle three rows were counted to determine the number of leaves on each plant at the maturity stage. Plant height is determined by taking a measurement from the top of the ground to the tips of the panicles of the ten plants in each of the middle three rows. Measurement of the length of each panicle from base to tip was used to record the length of each panicle. At harvest, the weight of 1000 seeds and the grain yield (kg/plot) were recorded from the plants in the middle three rows of each plot. From harvested regions, the grain yield was calculated. Last but not least, the grain yield per hectare (t ha −1 ) was computed by translating the grain yield from each plot’s middle three harvested rows into hectares. The grains’ moisture content was changed to 12.5% ( Tsedaley et al. 2023 ). Data analysis All disease assessment and agronomic data were analyzed using SAS software version 9.4 ( SAS 2015 ). LSD test at p<0.01 level of probability was used for mean comparisons among treatments for treatments with significant differences. Correlation tests were carried out between disease parameters and grain yield, weather variables and disease severity, disease severity and grain yield, and AUDPC with grain yield, as well as yield-related traits of the tested sorghum genotypes in the two districts, and analyzed using SAS software. Regression analysis between AUDPC and grain yield was performed using SAS software version 9.4. Results Sorghum genotype responses to anthracnose disease At both sites (Assosa and Bambasi) districts, the mean disease severity of all evaluated sorghum genotypes differed significantly (p<0.01 and p<0.001), respectively. The average severity of anthracnose in the Assosa district ranged from 59.6 to 77.3 PSI. The genotype of Baco Striga sorghum was found to be sensitive (77.3 PSI), whereas the most resistant genotype was Mersa-1 (59.6 PSI), followed by SC748-5 (66.8 PSI). The mean severity of anthracnose in the Bambasi district ranged from 52.8 to 82.4 PSI ( Table 2 ). Similarly, the ACC-BRC-18 genotype was the most resistant (52.8 PSI) compared to the other genotypes. Whereas, Baco Striga sorghum genotype which was shown to be sensitive (82.4 PSI). Across the seven sorghum genotypes that were evaluated, at Assosa district had a higher overall disease pressure than Bambasi district. This implied that MAS decreases between 1 and 19 PSI were seen. This showed that the seven evaluated sorghum genotypes growing in the Bambasi district had MAS reductions ranging from 1 to 19 PSI. At Bambasi district ACC-BRC-18 and ACC-BRC-5 genotypes had the lowest anthracnose severity score as compared with others. Table 2. Sorghum genotype responses to anthracnose severity index and rate of disease progression at Assosa and Bambasi districts, Ethiopia. Genotype Mean anthracnose severity (PSI) Disease progress rate (logit day −1 ) Assosa Bambasi Assosa Bambasi Baco Striga 77.3 ± 7.6 a 82.4 ± 2.4 a 0.195 ± 0.003 a 0.184 ± 0.003 a ACC-BRC-18 71.5 ± 8.1 abc 52.8 ± 3.7 g 0.070 ± 0.014 b 0.027 ± 0.008 ef BRC-378 74.9 ± 5.7 ab 58.5 ± 4.8 efg 0.079 ± 0.027 b 0.031 ± 0.011 ef ACC-BRC-5 73.4 ± 10.4 abc 55.8 ± 3.5 fg 0.071 ± 0.027 b 0.021 ± 0.004 f BRC-245 73.5 ± 2.0 abc 61.7 ± 4.5 de 0.072 ± 0.025 b 0.039 ± 0.010 de BTx623 74.2 ± 2.2 abc 63.8 ± 6.3 cde 0.061 ± 0.004 b 0.059 ± 0.018 bc Mersa-1 59.6 ± 2.3 d 70.9 ± 2.8 b 0.056 ± 0.021 b 0.061 ± 0.005 b SC748-5 66.0± 9.3 cd 68.2 ± 2.6 bc 0.073 ± 0.016 b 0.193 ± 0.004 a Geremew 66.7± 7.0 bcd 65.5 ± 1.0 bcd 0.054 ± 0.010 b 0.048 ± 0.011 cd Assosa-1 74.7± 1.4 ab 60.3± 1.7 def 0.063 ± 0.021 b 0.025 ± 0.004 f CV (%) 7.03 5.2 20.91 10.4 In the 2020 cropping season, the disease progress rate was calculated for all sorghum genotypes at the two districts (Assosa and Bambasi). Among the tested sorghum genotypes, there was a highly significant (p<0.001) difference in the observed disease rate ( Table 2 ). The disease progress rate at Assosa district ranged from 0.054 to 0.195 (logit day −1 ). The Baco Striga showed the greatest rate of disease development (0.195), whilst the Geremew genotype showed the slowest rate of disease development (0.054) compared to other genotypes. The disease progression rate in the Bambasi district ranged from 0.021 to 0.193. The SC748-5 and Baco Striga genotypes showed a quicker rate of disease progress (0.193 and 0.184, respectively). On ACC-BRC-5 sorghum genotypes, the slowest disease development (0.021) was observed in the Bambasi district. All studied sorghum genotypes, with the exception of Baco Striga and SC748-5 genotypes planted in the Bambasi district as opposed to the Assosa district, showed decreased rates of disease development overall. In general, Assosa district saw a faster rate of disease development than Bambasi district for the genotypes of sorghum that were evaluated. The AUDPC analysis, which was conducted using severity records, revealed substantial (p<0.01 and p<0.001) variations in the genotypes of sorghum examined across the two districts (Assosa and Bambasi) in the 2020 cropping season ( Figure 1 ). The Assosa district’s AUDPC ranged from 351% to 470% of days. The Baco Striga yielded the greatest AUDPC value (470% days), indicating a genotype that was sensitive to the disease. On the other hand, Mersa-1 produced the lowest AUDPC value (351% days), which was followed by genotypes SC748-5 and Geremew, which were found to be resistant ( Figure 1 ). The AUDPC ranged from 316 to 499% days in the Bambasi district. Baco Striga, the genotype that was released as Striga resistant, has the highest AUDPC score (499% days). Conversely, the genotypes ACC-BRC-18 and ACC-BRC-5, which were discovered to be resistant genotypes, had the lowest AUDCP values (316 and 334% days) when assessed ( Figure 1 ). With the exception of Baco Striga, Mersa-1, and SC748-5, all genotypes had greater AUDPC values in the Assosa district compared to the Bambasi district. Figure 1. AUDPC of anthracnose disease on ten sorghum genotypes examined in Assosa and Bambasi districts, Ethiopia. Sorghum anthracnose’s temporal dynamics During the 2020 main cropping season, there were differences in the beginning and progression rate of anthracnose disease across the genotypes and sites that sorghum were evaluated. During the 2020 main cropping season, the disease began sooner and spread quickly on Baco Striga sorghum genotypes in both Assosa and Bambasi districts ( Figures 2 and 3 ). On the other hand, it appeared somewhat later and developed more slowly in Assosa district for the Mersa-1, SC748-5, and Geremew sorghum genotypes, and in Bambasi district for the ACC-BRC-18, ACC-BRC-5, and BRC-245 sorghum genotypes. Seven days’ worth of data revealed a statistically significant rise in the severity of anthracnose on all genotypes of sorghum that were evaluated in the second and third weeks in Assosa district and the second, third, and sixth weeks in Bambasi district. When the plants were in the flowering to grain filling stages, the anthracnose severity was at its maximum across all genotypes evaluated. In both places, this time frame matched the first and second week of October ( Figures 2 and 3 ). Figure 2. Disease progression curves for anthracnose outbreaks on 10 sorghum genotypes examined in Assosa district, Ethiopia. Figure 3. Disease progression curves for anthracnose outbreaks on 10 sorghum genotypes examined in Bambasi district, Ethiopia. Sorghum genotypes’ agronomic characteristics The agronomic characteristics (Leave number and Plant height) of all genotypes of sorghum that were evaluated demonstrated a highly significant (p<0.001) difference between each other within the two districts (Assosa and Bambasi) ( Table 3 ). In both locations, Assosa-1 sorghum genotype was grown to a height of 18 leaves. Whereas, the lowest (7) leave number recorded on BTx623 genotype followed by, Baco Striga at both locations. The majority of the sorghum genotypes that were evaluated generally had comparable leaf numbers at both locations. The genotype BRC-245 cultivated at both locations consistently measured the tallest plant height. However, the dwarf plant height on the genotype of BTx623 sorghum growing at both locations was measured. The majority of the sorghum genotypes that were evaluated grew marginally higher in the Assosa district compared to the Bambasi district. Table 3. Effects of sorghum genotypes on plant height and number of leaves in Assosa and Bambasi districts, Ethiopia. Genotype Leave number Plant height (cm) Assosa district Bambasi district Assosa district Bambasi district Baco Striga 8.1 ± 1.9 ef 6.7 ± 0.2 f 145.7 ± 53.8 de 116.6 ± 13.2 de ACC-BRC-18 14.7 ± 8.1 ab 15.0 ± 1.2 b 290.9 ± 36.6 ab 294.5 ± 39.6 a BRC-378 13.3 ± 4.4 c 12.3 ± 1.7 c 295.3 ± 43.5 ab 290.2 ± 30.9 a ACC-BRC-5 15.3 ± 1.4 abc 13.0 ± 0.9 c 276.0 ± 45.7 b 235.3 ± 40.3 b BRC-245 13.6 ± 0.7 c 12.5 ± 1.5 c 327.9 ± 35.6 a 322.5 ± 30.5 a BTx623 6.9 ± 0.2 f 7.3 ± 0.1 ef 85.5 ± 2.8 f 90.9 ± 1.9 e Mersa-1 11.4 ± 0.2 d 9.4 ± 1.1 d 208.7 ± 17.8 c 208.7 ± 31.5 c SC748-5 8.8± 0.8 e 7.3± 0.6 ef 121.9 ± 12.7 def 119.8 ± 35.2 de Geremew 10.9 ± 1.0 d 9.5± 0.5 d 107.6 ± 4.3 ef 110.2 ± 10.2 de Assosa-1 18.4± 1.7 a 17.5± 2.3 a 142.8 ± 17.7 de 139.9 ± 10.6 cd CV (%) 7.5 10.8 10.8 13.9 Components of sorghum genotypes related to yield The yield-related components of all genotypes of sorghum examined shown a highly significant (p<0.01) difference between each other within the two districts (Assosa and Bambasi) ( Table 3 ). With the exception of Baco Striga and SC748-5, the panicle length of every studied sorghum genotype revealed a taller look in the Bambasi district compared to the Assosa district. The examined genotypes’ grain yields are strongly positively correlated with the taller appearances of the panicle length ( Table 7 ). However, all examined sorghum genotypes in the Bambasi district showed somewhat higher 1000-seed weight (TSW) than in the Assosa district. In the Bambasi district, this clearly demonstrated increased grain yield increments and substantial positive associations for these genotypes ( Table 3 ). This demonstrated the degree to which the Bambasi district’s climate was conducive to the production of sorghum and the ability of the plants to assimilate photosynthetically into grains. Grain yields in the Assosa district were lower than in the Bambasi district due to the lower TSW recorded there. Sorghum genotypes’ grain yields There was a highly significant (p<0.001) variation in grain production across the 10 genotypes of sorghum that were examined within the districts of Assosa and Bambasi ( Table 4 ). Grain yield in the Assosa district ranged from 1.2 to 8.4 t ha −1 . On the Assosa-1 genotype, the maximum grain yield (8.4 t ha -1 ) was recorded. On the Mersa-1 genotype, the second-highest grain production (7.9 t ha -1 ) was recorded ( Table 4 ). Conversely, grain yield in the Bambasi district ranged from 1.3 to 8.9 t ha -1 . On the Assosa-1 genotype, the maximum grain yield of 8.9 t ha-1 was measured similarly. In the meantime, the districts of Assosa and Bambasi recorded the lowest grain yields, measuring 1.2 and 1.3 t ha −1 , respectively, based on the identical Baco Striga genotype ( Table 4 ). Prior to its release, Baco Striga was a genotype resistant to the weed Striga hermonithica. However, this genotype produced the least amount of grain at both locations and was therefore vulnerable to sorghum anthracnose disease. Table 4. Effects of sorghum genotypes on panicle length, TSW, and grain yield in districts of Assosa and Bambasi, Ethiopia. Genotype Panicle length (cm) TSW (g) Grain yield (t ha −1 ) Assosa district Bambasi district Assosa district Bambasi district Assosa district Bambasi district Baco Striga 18.5 ± 2.1 d 17.1 ± 2.3 d 14.7 ± 0.6 g 15.7 ± 0.4 e 1.2 ± 0.2 f 1.3 ± 0.3 f ACC-BRC-18 24.1 ± 0.8 bc 29.3 ± 0.8 ab 19.3 ± 0.2 e 19.5 ± 0.2 c 4.0 ± 0.1 d 4.3 ± 0.3 d BRC-378 22.0 ± 4.4 dc 27.7 ± 2.0 dc 25.8 ± 0.7 b 26.4 ± 0.7 a 7.7 ± 0.1 b 7.8 ± 0.2 b ACC-BRC-5 23.7 ± 2.3 bc 29.2 ± 1.2 ab 23.3 ± 1.6 cd 23.9 ± 1.6 b 3.6 ± 0.2 d 3.8 ± 0.4 d BRC-245 22.7 ± 2.6 c 27.5 ± 2.0 abc 23.3 ± 0.5 d 24.0 ± 0.1 b 7.7 ± 0.4 b 8.0 ± 0.5 b BTx623 23.6 ± 2.2 bc 26.0 ± 1.0 bc 15.5 ± 1.1 fg 16.5 ± 0.7 ed 2.8 ± 0.1 e 3.0 ± 0.4 e Mersa-1 27.3 ± 5.4 ab 30.1 ± 3.9 a 28.5 ± 0.7 a 27.1 ± 1.5 a 7.7 ± 0.2 b 7.9 ± 0.2 b SC748-5 28.3± 1.0 a 25.6± 0.6 c 16.7 ± 0.8 f 17.7 ± 1.0 cd 1.9 ± 0.1 f 2.2 ± 0.2 e Geremew 23.7± 0.4 bc 29.3± 0.6 ab 25.1 ± 0.04 bc 25.5 ± 0.8 ab 6.2 ± 0.8 c 6.5 ± 1.0 c Assosa-1 22.5± 2.3 dc 30.4± 1.8 a 25.3 ± 0.9 b 26.0 ± 1.4 a 8.4 ± 0.1 a 8.9 ± 0.3 a CV (%) 9.8 7.3 3.8 4.6 6.4 9.0 Overall, the Bambasi district achieved a larger grain yield than the Assosa district. The Assosa-1 genotype showed the most grain yield increase (0.5 t ha −1 ) in the Bambasi district. In terms of grain yield, this genotype performed best in both locations. Since the Assosa Agricultural Research Center released this genotype, it has been the most adapted to the Assosa zone, including the current study locations. Assosa-1 demonstrated a significant level of disease pressure, yet the current investigation found that this genotype is the highest performing genotype in both locations. The current study assessed the ACC-BRC-5 and Mersa-1 genotypes as the second highest performing genotypes at both the Assosa and Bambasi districts, in addition to the Assosa-1 genotype. In general, the Bambasi district saw a higher grain output than the Assosa district for all tested sorghum genotype. This might be because of the increased disease pressure in the Assosa district, which led to a reduction in photosynthetic areas and the development of coalescing necrotic lesions that covered the leaf surface. This finding verified that the Bambasi district was not friendly to the growth of the anthracnose disease, but it was highly advantageous for the production of sorghum crops. Apart from Assosa-1, the genotypes with resistance to anthracnose, ACC-BRC-5 and Mersa-1, also demonstrated the best grain yield in both testing locations. These two genotypes also had good quality and the tallest to moderately tall stalks, which produced a high harvestable biomass. Because biomass serves a variety of uses, farmers value this highly. Analysis of the relationship between meteorological conditions and the severity of sorghum anthracnose The ten tested sorghum genotypes were subjected to a correlation coefficient study between the seven round anthracnose severity assessment records and weakly meteorological variables across two locations. The ten sorghum genotypes' anthracnose severity was positively correlated (p<0.01) weekly total rainfall, relative humidity and negatively correlated (p<0.01) with, mean maximum temperature ( Table 5 ). Nonetheless, a positive but not significant correlation was found between the anthracnose severity and the interaction of the mean minimum and average temperature. According to this finding, mean maximum temperature, relative humidity, and rainfall are more accurate predictors of anthracnose development in the field than mean lowest temperature and average temperature. Table 5. The correlation coefficient between weather variables and the sorghum anthracnose severity (PSI) at Assosa districts in Western Ethiopia, was measured at weekly intervals. Weather variables Genotype Baco Striga ACC-BRC-18 BRC-378 ACC-BRC-5 BRC-245 BTx623 Mersa-1 SC748-5 Geremew Assosa-1 WTRF 0.64 * 0.72 ** 0.68 * 0.69 ** 0.75 ** 0.74 ** 0.47 * 0.54 * 0.54 * 0.78 ** Min To 0.23 ns 0.46 ns 0.45 ns 0.45 ns -0.35 ns 0.27 ns 0.31 ns 0.35 ns 0.35 ns -0.06 ns Max To -0.23 ns -0.16 ns -0.15 ns -0.14 ns -0.27 ns -0.30 ns -0.09 ns -0.12 ns -0.13 ns -0.63 * Ave To 0.37 ns 0.18 ns 0.20 ns 0.17 ns 0.34 ns 0.41 ns 0.23 ns 0.27 ns 0.27 ns 0.66 ns RH 0.63 * 0.83 ** 0.80 ** 0.80 ** 0.81 ** 0.76 ** 0.54 * 0.65 * 0.65 * 0.73 ** *** Significant at p <0.001. ** Significant at p <0.01. * Significant at p <0.05. Correlation study between the severity and rate of disease progression of the sorghum anthracnose disease and the grain yield of the crop The analysis of the correlation coefficient between the grain yield of ten sorghum genotypes grown in the Assosa and Bambasi districts and the records of the seven rounds of anthracnose severity assessment revealed a negative non-significant relationship from the first to the fifth round of assessments, and a negative significant (p<0.05) relationship at the sixth and seventh round of assessments ( Table 6 ). Table 6. The correlation coefficients between the weekly severity of anthracnose and the rate at which the disease progressed and the grain yield of the sorghum genotypes evaluated in the Assosa and Bambasi districts during the 2020 cropping season in the Assosa Zone, Western Ethiopia. Grain yield tonnes ha −1 Anthracnose severity at days after sowing (PSI) Disease progression rate 85 92 99 106 123 130 137 Assosa -0.06 ns -0.06 ns -0.12 ns -0.18 ns -0.24 ns -0.31 * -0.23 * -0.74 *** Bambasi -0. 17 ns -0.05 ns -0.2 ns -0.33 ns -0.40 * -0.39 * -0. 36 * -0.67 *** * Significant at p <0.05. ** Significant at p <0.01. *** Significant at p <0.001. This finding suggests that when the plant reaches maturity, the disease’s impacts are mostly felt in the reduction of grain output. Furthermore, for the studied sorghum genotypes at both locations, a significant negative correlation was found between the rate of disease progression and grain yield ( Table 4 ). Analysis of the correlation between AUDPC, agronomic factors, grain yield of sorghum, and components linked to yield In the districts of Assosa and Bambasi, the agronomic characteristics (plant height and leaf number) exhibited strong negative significant (p<0.001) and negative non-significant relationships with AUDPC, respectively ( Table 7 ). In both locations, there was a strong negative significant (p<0.001) association between panical length and AUDPC. At both locations, TSW displayed a non-significant negative connection with grain yield. Conversely, Table 7 indicates that there was a significant positive association (p<0.01) between the genotypes of sorghum at both locations and the number of leaves, plant height, panicle length, and TSW. This demonstrated the extent to which the disease affected the sorghum genotypes’ grain filling at both locations negatively. Furthermore, the degree of anthracnose damages in sorghum production in these areas was demonstrated by the negative correlation found between AUDPC, agronomic characteristics, grain yield, and yield-related features. Table 7. Sorghum anthracnose (AUDPC) correlation coefficients, agronomic parameters, grain yield, and yield-related components of sorghum genotypes investigated at Assosa and Bambasi districts, Ethiopia. Location Assosa district Bambasi district Leave number Plant height (cm) Panicle length (cm) TSW (gm) Grain yield t ha −1 Leave number Plant height (cm) Panicle length (cm) TSW (g) Grain yield t ha −1 AUDPC (%-days) -0.24 ns -0.22 ns -0.69 *** -0.24 ns -0.25 * -0.65 *** 0.51 ** -0.64 *** -0.33 ns -0.38 * Leave number 1 0.56 *** 0.20 ns 0.51 *** 0.56 *** 1 0.57 *** 0.59 *** 0.50 ** 0.58 *** Plant height (cm) 1 0.12 ns 0.33 * 0.36 ** 1 0.32 ns 0.33 ns 0.0.40 * Panicle length (cm) 1 0.33 * 0.33 * 1 0.63 *** 0.62 *** TSW (g) 1 0.88 *** 1 0.88 *** *** Significant at p <0.001. ** Significant at p <0.01. * Significant at p <0.05. Analysis of regressions between sorghum crop yield and the AUDPC of anthracnose For the ten sorghum genotypes examined in the Assosa and Bambasi districts in the 2020 cropping year, linear regression of the AUDPC was utilized to estimate the grain yield loss ( Figure 4a and b , respectively). Compared to severity linear regression, AUDPC linear regression provided a clearer picture of the link between disease and yield loss. However, disease progress curves are not a reliable indicator of the correlation between disease severity and yield because they are extremely susceptible to changes in epidemiological parameters during the course of the disease. Since the intensity and duration of the disease affect crop production loss, the AUDPC takes these parameters into consideration ( Chaube and Pundhir 2005 ). This is the association that Sahile et al. (2008) observed in single and mixed cropping systems under Ethiopian conditions between yield loss and chocolate spot on faba beans ( Vicia faba L.). Figure 4. Linear regression relating AUDPC of anthracnose with grain yield on ten sorghum genotypes examined at Assosa (a) and Bambasi (b) districts. In the cropping season of 2020, the model’s association between anthracnose AUDPC and grain yield explained 83.5 and 78.7% of the variation at Assosa and Bambasi Districts, respectively ( Figure 4a and b ). The model-indicated connection between anthracnose AUDPC and grain yield explained 83.5 and 78.7% of the variance at the Assosa and Bambasi Districts ( Figure 4a and b ), respectively. With estimated regression coefficients of b1= -20.0 and -14.6 kg ha −1 , respectively, the regression line found for Bambasi District had a higher slope than that of Assosa District. The calculations show that on different sorghum genotypes in Bambasi District and Assosa District, there were 20.0 and 14.6 kg ha −1 grain production losses for every percent per day AUDPC increase of sorghum anthracnose, respectively. Discussion Sorghum is the fifth-most important cereal crop in the world, and anthracnose has a significant impact on its productivity. Farmers with limited resources are not advised to employ fungicides as a disease control strategy for anthracnose due to the financial benefits ( Marley et al. 2004 ). The primary strategy for managing this disease has been genetic resistance; however, due to the great degree of heterogeneity in the pathogen population, host-specific resistance is frequently unstable ( Ali et al. 1987 ; Bressan and Figueiredo 2003 ). According to the current study, Assosa district had a higher disease pressure than Bambasi district, and different sorghum genotypes responded to anthracnose disease in different ways at different places. This may be caused by variations in the pathogen’s virulence and aggression as well as local climatic conditions. Additionally, Tsedaley et al. (2021) reported that the isolate from Assosa field 7 (CsAs7), which was tested in a greenhouse setting in Jimma, Ethiopia, on ten known sorghum differentials, was more aggressive and produced the highest severity of anthracnose disease when compared to the isolate obtained from the other major sorghum-growing areas of southwestern and western Ethiopia. As a result, the Assosa district C. sublineolum isolate may be crucial to the global development of anthracnose disease-resistant sorghum genotypes through disease resistance screening. Furthermore, the development of resistant varieties through resistance breeding programs may be significantly influenced by the variations in responses of sorghum genotypes between sites. One of the best and most effective ways to handle sorghum anthracnose in the field is to use resistant cultivars ( Tsedaley et al. 2023 ). A notable decrease in intensity was noted in the Bambasi district. Moreover, during the main cropping season of 2020, anthracnose severity across the two locations exhibited a non-significant positive correlation with mean minimum temperature and average temperature, a non-significant positive correlation with mean maximum temperature, and a significant positive correlation with weekly total rainfall and relative humidity. Additionally, during the 2014 cropping season, Rana et al. (2021) found a negative correlation between the percent severity index of anthracnose and the highest temperature, minimum temperature, and nighttime relative humidity. Furthermore, Tsedaley et al. (2023) found that, on six frequently tested sorghum genotypes at Jimma during the 2014 and 2015 cropping seasons, anthracnose severity was negatively correlated with mean minimum and mean maximum temperature and positively correlated with weekly total rainfall and average temperature. The current study’s findings suggest that mean maximum temperature, relative humidity, and rainfall are reliable indicators of anthracnose development in the field than mean minimum and average temperature. The percentage severity index of sorghum anthracnose, as reported by Tsedaley et al. (2016) , also demonstrated a strong negative correlation with varying altitude ranges. This finding may be related to variations in temperature and relative humidity across various altitudes in western and southwestern Ethiopia. Significant losses are associated with this disease in tropical regions where high temperatures and humidity support the growth, propagule dissemination, and sporulation of C. sublineolum ( Pastor-Corrales and Frederiksen 1980 ). The current study reveals that the Baco Striga sorghum genotype, which was previously identified as resistant to Striga hermonithica weed, is really very susceptible to anthracnose disease, as seen by the low grain production at both locations. This demonstrated that the breeders disregarded the genotype’s reaction to anthracnose disease, either when they released it or possibly as a result of the presence of various physiological races of C. sublineolum, the pathogen’s variable nature, and its capacity to disrupt the genotypes’ resistant gene. According to Da Costa et al. (2003) , C. sublineolum is regarded as a very diverse species due in part to the several pathotypes that have been identified based on varying degrees of virulence on host lines. Furthermore, Prom et al. (2009) noted that the pathogen’s unpredictable character makes it difficult to successfully deploy current cultivars and breed for resistance. As a result, controlling host resistance genes, altering the host-pathogen environment, and lowering the sources of inoculum are essential for the long-term control of anthracnose ( Frederiksen 1986 ). We verified the unique disease outbreaks observed in these research regions. This could be because of the warm, humid climate in these research sites, which has aided in the disease’s quick onset and spread throughout these regions. Within the two locations, we also saw significant differences in the severity of anthracnose between the genotypes of sorghum that were evaluated. These variations could be caused by changes in the host’s physiological stage, interactions with pathogens, or environmental factors ( Thakur and Mathur 2000 ). Our data are consistent with the findings of Thakur and Mathur (2000) , who found that the pathogen could infect all aboveground plant parts, such as the stalk, leaves, panicle, inflorescence, and grain/seed, reducing the number and quality of both the stalk and the grain. In the current study, the genotypes under investigation had the lowest grain yields in both locations due to the highest disease pressure, which is defined as foliar tissue infection. This may result from the pathogen’s hypersensitive lesions covering a portion of the leaf’s photosynthetic region. Although additional research is necessary to validate our findings, we advise breeders to adopt the genotype of Baco Striga sorghum as a check line in their breeding program to increase resistance to anthracnose disease. This recommendation is based on the results of our two locations. In the current investigation, the disease manifested itself in a distinct way on the examined sorghum genotypes in each of the two experimental study locations. Marley et al. (2001) , Thakur et al. (2007) , and Tsedaley et al. (2023) have also reported findings that are similar. The degree of host susceptibility, the pathogen’s variability, and the local weather in the research regions could all play a significant role. Inoculum density, the pathogenicity of the strains, and cultural techniques also had an impact ( Pande et al. 1991 ; Chala et al. 2010a , b ). The current study’s findings indicate that during the 2020 main cropping season, Assosa district experienced a higher severity of sorghum anthracnose than Bambasi district. This might be the result of ideal weather during that cropping session, which included heavy rainfall and high relative humidity in the Assosa district. According to Frederiksen (2000) , prolonged cloudy, warm, humid, and wet weather is particularly conducive to the disease’s severity, particularly when it happens during the crop’s early grain-filling stage. The current study found a considerable negative association between AUDPC and yield, yield-related characteristics, and agronomic variables. This is consistent with Desalegn et al.’s findings ( 2022 ). The Assosa district showed reduced TSW, higher grain weight losses, and shorter panicle length in the current study. This is because all sorghum genotypes at that site had the highest anthracnose severity effect on record. According to Casela and Ferreira (1987) , C. sublineolum conidia impede the flow of nutrients and water through the vascular tissues of the plant, which stunts the growth of the panicle and grain. Ali et al. (1987) also documented reductions in grain yield because of fungal infection, which is typically linked to a decrease in grain size. Generally speaking, developing resistant cultivars is the main strategy for controlling sorghum anthracnose. Also, determining the ideal sowing time requires an understanding of the temporal and spatial dynamics of the disease. This understanding helps to establish management techniques that are efficient, economical, secure, and long-lasting ( Chala et al. 2010a ). To consider sowing date as a management option for anthracnose, however, one must first determine the disease’s life cycle and the best time to reach its peak ( Tsedaley et al., 2023 ). The differences between genotypes with varied resistance levels and meteorological factors in terms of when anthracnose disease develops was also demonstrated by our most recent studies. There were notable differences in the course of the disease between the studied sorghum genotypes in each location. In the Assosa district, anthracnose development progressed more slowly on the sorghum genotypes Mersa-1, SC748-5, and Geremew; in the Bambasi district, it progressed more slowly on the sorghum genotypes ACC-BRC-18, ACC-BRC-5, and BRC-245. In both locations, the Mersa-1 genotype consistently displayed the lowest disease pressure and higher grain yields. As a result, we suggested that farmers in the districts of Assosa and Bambasi give the Mersa-1genetype some thought as the ideal substitute to fend against anthracnose and increase output in these regions. We discovered that the months of September through October were the busiest for the establishment of anthracnose disease and had a significant detrimental impact on the grain yields of Western Ethiopian sorghum genotypes. According to Chala et al. (2010a) and Tsedaley et al. (2023) , the disease peaks in south and southwest Ethiopia was during August and September, respectively. This suggests that in south, southwest, and western Ethiopia, September is a more favorable month for the development of anthracnose disease. This may have to do with the increased rainfall in these regions, which creates ideal climatic conditions for the pathogen’s growth, the crop’s developmental (flowering) stage, and the pathogen’s peak period. According to Tsedaley et al. (2023) , it is crucial and more successful to implement management strategies that coincide with the sensitive stage of the crop and the period when the disease develops in order to lessen the severity of the disease and increase grain yield. Moreover, adjusting the sowing date may be a significant strategy for decreasing the severity of sorghum anthracnose and ultimately raising grain yield. The findings of ( Gwary et al. 2008 ; Chala and Tronsmo 2011 ; Chala et al. 2010b ) are consistent with our findings. It is well known that three factors must coincide for any disease to develop: the host must be sensitive, the virus must be virulent, and the weather must be favorable ( Tsedaley et al. 2023 ). Accordingly, during the main cropping season of 2020 in Assosa district as opposed to Bambasi district, the weather is more conducive to the development of anthracnose disease on genotypes of sorghum that have been studied in Western Ethiopian fields. Under field conditions, weather factors significantly influenced the development of anthracnose disease and the grain yield of several genotypes of sorghum. The incidence and severity of sorghum anthracnose have been demonstrated to be significantly influenced by meteorological factors, including relative humidity and rainfall. Important variables for the development of anthracnose disease include relative humidity, cumulative and frequency of rainfall ( Frederiksen 1986 , 2000 ; Erpelding and Prom 2004 ; Rana et al. 2020 ). Anthracnose is a polycyclic disease that is favorably affected by high humidity and rainfall, moderate temperatures, and a significant amount of inoculum ( Frederiksen 1986 ). The grain yield of every investigated sorghum genotype in both locations was negatively impacted, albeit not significantly, by the anthracnose severity assessments from the first to the fifth round. This might be because the lower leaves contribute less to the process of grain-filling, which turns photosynthetic products into grain. The current study’s findings are consistent with those of Tsedaley et al. (2023) , who reported that the upper leaves play a more significant role in grain growth and that greater severity during the grain-filling to maturity stage led to a significant drop in grain production. The flag leaf ( Stoy 1963 ; Stamp and Herzog 1976 ) contributes the majority of photosynthate used in grain filling. The number of seeds per panicle increased as panicle length increased, and vice versa for grain size and grain yield. There was also a substantial positive correlation between panicle length, TSW, and grain yield. Severe anthracnose infections, meteorological conditions that affect photosynthesis and the quantity of food stored all have a significant impact on grain size ( Tsedaley et al. 2023 ). Thus, choosing a more resistant sorghum genotype and a suitable site may be crucial to reducing the severity of anthracnose and raising the grain yield of the sorghum crop in the Western Ethiopian districts of Assosa and Bambasi. Conclusion and recommendation Rainfall, mean maximum temperature, relative humidity, and the various resistance levels of sorghum genotypes all had a significant impact on the severity of anthracnose under field conditions. Grain filling was significantly impacted negatively by disease pressure, which causes significant yield losses in genotypes that are sensitive. Therefore, managing this serious sorghum disease worldwide may benefit greatly from an awareness of these factors. The results also demonstrated that Ethiopian germplasms are very probable sources of anthracnose disease resistance genes. Farmers in the Assosa and Bambasi districts, as well as other places in Western Ethiopia with a similar agro-ecology, are advised to utilize Mersa-1 sorghum genotypes due to their good performance, which includes strong resistance to anthracnose, vigor growth, and better grain yield. Breeders might utilize the Baco Striga sorghum genotype as a check line in a breeding effort to resist anthracnose disease because it shown a high vulnerability to the disease at both locations. Ethics approval and consent to participate Not applicable. Consent for publication Not applicable. Authors’ contributions Binyam Tsedaley and Kumlachew Alemu: designed the study, performed the experiments, analysed data and wrote the manuscript. Both authors read and approved the final manuscript. Data availability statement The data supporting this research are available in figshare ( Tsedaley and Alemu, 2024 ): Title: Evaluate reaction of sorghum genotypes for sorghum anthracnose in Ethiopia. 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Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 28 Oct 2024 ADD YOUR COMMENT Comment Author details Author details 1 College of Agriculture and Natural Resource, Assosa University, Assosa, NA, NA, Ethiopia Binyam Tsedaley Roles: Conceptualization, Data Curation, Funding Acquisition, Investigation, Methodology, Writing – Original Draft Preparation Kumlachew Alemu Roles: Formal Analysis, Investigation, Methodology, Supervision, Writing – Review & Editing Competing interests No competing interests were disclosed. Grant information The research was funded by Assosa University, grant number: ASU/RD/2019 The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Article Versions (2) version 2 Revised Published: 17 Mar 2025, 13:1290 https://doi.org/10.12688/f1000research.156145.2 version 1 Published: 28 Oct 2024, 13:1290 https://doi.org/10.12688/f1000research.156145.1 Copyright © 2025 Tsedaley B and Alemu K. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Tsedaley B and Alemu K. Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.12688/f1000research.156145.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 2 VERSION 2 PUBLISHED 17 Mar 2025 Revised Views 0 Cite How to cite this report: Zewotir T. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r381619 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-381619 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 09 Jun 2025 Temesgen Zewotir , University of KwaZulu Natal, KwaZulu-Natal, South Africa Approved VIEWS 0 https://doi.org/10.5256/f1000research.178969.r381619 The paper is well motivated and well written. The data and the analysis is well executed. The analysis provide excellent insight about disease progress rate, yield-related trait, sorghum grain yield, and mean severity index at the two research stations: ... Continue reading READ ALL The paper is well motivated and well written. The data and the analysis is well executed. The analysis provide excellent insight about disease progress rate, yield-related trait, sorghum grain yield, and mean severity index at the two research stations: the Bambasi district and Assosa district. Occasionally the authors tend to compare and draw firm conclusion between the two stations results without statistical significance test. Describing the two station results is perfectly acceptable but comparing drawing a conclusion should be done with appropriate statistical test. Accordingly I suggest the authors to be cautious of this. Secondly the authors indicated they used SAS software for their analysis, it would be useful to state which SAS procedure they have used for each analysis.. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Partly Are all the source data underlying the results available to ensure full reproducibility? Partly Are the conclusions drawn adequately supported by the results? Yes Competing Interests: No competing interests were disclosed. Reviewer Expertise: Statistics I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Zewotir T. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r381619 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-381619 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Views 0 Cite How to cite this report: Leta A. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r371384 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-371384 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 24 Mar 2025 Ararsa Leta , Ambo University, Ambo, Oromia, Ethiopia Approved VIEWS 0 https://doi.org/10.5256/f1000research.178969.r371384 I appreciate the authors' efforts in addressing the reviewer comments and making substantial improvements to the manuscript. The incorporation of additional data in Table 1, the refinements in text clarity, and the adjustments to table numbering have significantly enhanced the ... Continue reading READ ALL I appreciate the authors' efforts in addressing the reviewer comments and making substantial improvements to the manuscript. The incorporation of additional data in Table 1, the refinements in text clarity, and the adjustments to table numbering have significantly enhanced the overall quality and readability of the study. The revisions effectively strengthen the manuscript’s conclusions and provide a clearer presentation of the findings. Based on these improvements, I find the revisions to be appropriate and sufficient. Competing Interests: No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Leta A. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r371384 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-371384 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Version 1 VERSION 1 PUBLISHED 28 Oct 2024 Views 0 Cite How to cite this report: Leta A. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.171415.r366819 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v1#referee-response-366819 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 03 Mar 2025 Ararsa Leta , Ambo University, Ambo, Oromia, Ethiopia Approved with Reservations VIEWS 0 https://doi.org/10.5256/f1000research.171415.r366819 Introduction paragraph 1, the last citation. (USAD 2012) Do You mean USAID? Please check. paragraph 2, the last lines. The term foliar; The term is not appropriate to indicate the phonological growth stage of ... Continue reading READ ALL Introduction paragraph 1, the last citation. (USAD 2012) Do You mean USAID? Please check. paragraph 2, the last lines. The term foliar; The term is not appropriate to indicate the phonological growth stage of the crop; it is simply the above ground plant part at different stages. Do you mean vegetative stage? Please correctly indicate . paragraph 4, 3 rd line. The application of biocontrol methods has been suggested by Michereff et al. (1994) as a potential remedy for anthracnose management. Too old to reflect the current advancement and reality of the potential of biocontrol method for this pathogen. Please replace with recent one. Materials and methods In materials for the experiment. Sartu, ACC-BRC-18, BRC-378, ACC-BRC-5, BRC-245, BTx623, SC748-5, Assosa-1, and Mersa-1. It is good if there is a table for detail description of the genotypes including their year of release, center released the varieties, source of the material and anthracnose reaction at time of release. Results In the 1 st paragraph last lines. This showed that the seven …. Why seven? While you evaluate ten genotype? What is you reference point to say genotype show disease reduction? In section Sorghum genotypes' agronomic characteristics. Delete the phrase ‘In the 2020 cropping season’, Since your data is one year data no need to mention the year hear, and you already mentioned the experiment is done in 2020 in methodology In section Components of sorghum genotypes related to yield. Delete the phrase ‘In the 2020 cropping season’ In section Sorghum genotypes' grain yields. Delete the phrase ‘In the 2020 cropping season’ In section Sorghum genotypes' grain yields 2 nd paragraph. The ten frequently…. Delete term frequently, the genotypes are once evaluated in the current study , The nine sorghum genotypes'….. Delete frequently. The genotypes are once evaluated in the current study Table 4. The correlation coefficient between weather variables and the sorghum anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi, was measured at weekly intervals. - As the weather variables for the two districts were different please do the analysis separately and present the table for each district Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests: No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Leta A. Reviewer Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.171415.r366819 ) The direct URL for this report is: https://f1000research.com/articles/13-1290/v1#referee-response-366819 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 17 Mar 2025 Binyam Tsedaley , Plant Science, Assosa University, Asosa, Ethiopia 17 Mar 2025 Author Response Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is ... Continue reading Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is USAID (United States Agency for International Development) , and we have corrected it accordingly. Paragraph 2, last lines. The term foliar is not appropriate for indicating the phonological growth stage of the crop; it refers to above-ground plant parts at different stages. Did you mean vegetative stage ? Please clarify. ✔ Yes, this was a typographical error. The correct term is flowering stage , not foliar stage . We have revised it accordingly. Paragraph 4, third line. The application of biocontrol methods was suggested by Michereff et al. (1994) for anthracnose management. This reference is outdated and does not reflect current advancements in biocontrol methods. Please replace it with a more recent source. ✔ We agree and have replaced the reference with the following updated statement: "Biological control using antagonistic organisms such as Trichoderma species, Pseudomonas syringae , and Pseudomonas chlororaphis has been extensively studied due to their characteristics, including fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, and production of antibiosis (Khan et al., 2018; Sharma et al., 2019)." Materials and Methods Description of sorghum genotypes: It would be beneficial to provide a table detailing the genotypes, including the year of release, the center that released them, their source, and their anthracnose reaction at the time of release. ✔ We appreciate this suggestion and have now included the following table in our manuscript: Table 1. Sorghum varieties with their crop passport S.N Variety name Pedigree Name Year of Release Disease Reaction Altitude Yield (q/ha) Seed Source Research Center Farmers Field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Source: MOA and BARC Where: HR*= Highly Resistant under greenhouse, HS= Highly Susceptible, MR =Moderately Resistant, R= Resistant, S = Susceptible and - = no information Results First paragraph, last lines: The phrase "This showed that the seven…" – Why mention seven genotypes when ten were evaluated? What is the reference point for identifying genotypes with disease reduction? ✔ As indicated in Table 2 , only seven genotypes ( excluding Baco Striga, Mersa-1, and SC748-5 ) showed severity reduction at Bambasi compared to Assosa district. This is why we referred to seven genotypes rather than ten. Section: Sorghum genotypes' agronomic characteristics. Delete the phrase "In the 2020 cropping season." Since the study covers only one year, this phrase is unnecessary. The methodology section already mentions that the experiment was conducted in 2020. ✔ We accept the comment and have deleted "In the 2020 cropping season" from the manuscript. Section: Components of sorghum genotypes related to yield. Delete the phrase "In the 2020 cropping season." ✔ We have removed this phrase as suggested. Section: Sorghum genotypes' grain yields. Delete the phrase "In the 2020 cropping season." ✔ We have deleted the phrase from the manuscript. Section: Sorghum genotypes' grain yields (second paragraph). The phrase "The ten frequently evaluated genotypes…" should be revised. The term "frequently" is misleading because the genotypes were evaluated only once in this study. ✔ We agree and have removed the word "frequently" , revising the sentence accordingly. Table 4: Correlation between weather variables and anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi. The weather data for the two districts are different. Please analyze and present them separately. ✔ We appreciate the suggestion. However, since weather data was only available for Assosa district and not for Bambasi district, a separate analysis is not possible. Instead, we have revised the table title to specify that the correlation analysis pertains only to Assosa district. Regarding the term "frequently tested genotypes" , it was intended to indicate that these six sorghum genotypes were evaluated over two cropping seasons at Jimma. This revised response is clear, concise, and professional, addressing all reviewer comments effectively. Let me know if you need any further refinements! Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is USAID (United States Agency for International Development) , and we have corrected it accordingly. Paragraph 2, last lines. The term foliar is not appropriate for indicating the phonological growth stage of the crop; it refers to above-ground plant parts at different stages. Did you mean vegetative stage ? Please clarify. ✔ Yes, this was a typographical error. The correct term is flowering stage , not foliar stage . We have revised it accordingly. Paragraph 4, third line. The application of biocontrol methods was suggested by Michereff et al. (1994) for anthracnose management. This reference is outdated and does not reflect current advancements in biocontrol methods. Please replace it with a more recent source. ✔ We agree and have replaced the reference with the following updated statement: "Biological control using antagonistic organisms such as Trichoderma species, Pseudomonas syringae , and Pseudomonas chlororaphis has been extensively studied due to their characteristics, including fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, and production of antibiosis (Khan et al., 2018; Sharma et al., 2019)." Materials and Methods Description of sorghum genotypes: It would be beneficial to provide a table detailing the genotypes, including the year of release, the center that released them, their source, and their anthracnose reaction at the time of release. ✔ We appreciate this suggestion and have now included the following table in our manuscript: Table 1. Sorghum varieties with their crop passport S.N Variety name Pedigree Name Year of Release Disease Reaction Altitude Yield (q/ha) Seed Source Research Center Farmers Field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Source: MOA and BARC Where: HR*= Highly Resistant under greenhouse, HS= Highly Susceptible, MR =Moderately Resistant, R= Resistant, S = Susceptible and - = no information Results First paragraph, last lines: The phrase "This showed that the seven…" – Why mention seven genotypes when ten were evaluated? What is the reference point for identifying genotypes with disease reduction? ✔ As indicated in Table 2 , only seven genotypes ( excluding Baco Striga, Mersa-1, and SC748-5 ) showed severity reduction at Bambasi compared to Assosa district. This is why we referred to seven genotypes rather than ten. Section: Sorghum genotypes' agronomic characteristics. Delete the phrase "In the 2020 cropping season." Since the study covers only one year, this phrase is unnecessary. The methodology section already mentions that the experiment was conducted in 2020. ✔ We accept the comment and have deleted "In the 2020 cropping season" from the manuscript. Section: Components of sorghum genotypes related to yield. Delete the phrase "In the 2020 cropping season." ✔ We have removed this phrase as suggested. Section: Sorghum genotypes' grain yields. Delete the phrase "In the 2020 cropping season." ✔ We have deleted the phrase from the manuscript. Section: Sorghum genotypes' grain yields (second paragraph). The phrase "The ten frequently evaluated genotypes…" should be revised. The term "frequently" is misleading because the genotypes were evaluated only once in this study. ✔ We agree and have removed the word "frequently" , revising the sentence accordingly. Table 4: Correlation between weather variables and anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi. The weather data for the two districts are different. Please analyze and present them separately. ✔ We appreciate the suggestion. However, since weather data was only available for Assosa district and not for Bambasi district, a separate analysis is not possible. Instead, we have revised the table title to specify that the correlation analysis pertains only to Assosa district. Regarding the term "frequently tested genotypes" , it was intended to indicate that these six sorghum genotypes were evaluated over two cropping seasons at Jimma. This revised response is clear, concise, and professional, addressing all reviewer comments effectively. Let me know if you need any further refinements! Competing Interests: The authors have no computing interests Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 17 Mar 2025 Binyam Tsedaley , Plant Science, Assosa University, Asosa, Ethiopia 17 Mar 2025 Author Response Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is ... Continue reading Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is USAID (United States Agency for International Development) , and we have corrected it accordingly. Paragraph 2, last lines. The term foliar is not appropriate for indicating the phonological growth stage of the crop; it refers to above-ground plant parts at different stages. Did you mean vegetative stage ? Please clarify. ✔ Yes, this was a typographical error. The correct term is flowering stage , not foliar stage . We have revised it accordingly. Paragraph 4, third line. The application of biocontrol methods was suggested by Michereff et al. (1994) for anthracnose management. This reference is outdated and does not reflect current advancements in biocontrol methods. Please replace it with a more recent source. ✔ We agree and have replaced the reference with the following updated statement: "Biological control using antagonistic organisms such as Trichoderma species, Pseudomonas syringae , and Pseudomonas chlororaphis has been extensively studied due to their characteristics, including fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, and production of antibiosis (Khan et al., 2018; Sharma et al., 2019)." Materials and Methods Description of sorghum genotypes: It would be beneficial to provide a table detailing the genotypes, including the year of release, the center that released them, their source, and their anthracnose reaction at the time of release. ✔ We appreciate this suggestion and have now included the following table in our manuscript: Table 1. Sorghum varieties with their crop passport S.N Variety name Pedigree Name Year of Release Disease Reaction Altitude Yield (q/ha) Seed Source Research Center Farmers Field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Source: MOA and BARC Where: HR*= Highly Resistant under greenhouse, HS= Highly Susceptible, MR =Moderately Resistant, R= Resistant, S = Susceptible and - = no information Results First paragraph, last lines: The phrase "This showed that the seven…" – Why mention seven genotypes when ten were evaluated? What is the reference point for identifying genotypes with disease reduction? ✔ As indicated in Table 2 , only seven genotypes ( excluding Baco Striga, Mersa-1, and SC748-5 ) showed severity reduction at Bambasi compared to Assosa district. This is why we referred to seven genotypes rather than ten. Section: Sorghum genotypes' agronomic characteristics. Delete the phrase "In the 2020 cropping season." Since the study covers only one year, this phrase is unnecessary. The methodology section already mentions that the experiment was conducted in 2020. ✔ We accept the comment and have deleted "In the 2020 cropping season" from the manuscript. Section: Components of sorghum genotypes related to yield. Delete the phrase "In the 2020 cropping season." ✔ We have removed this phrase as suggested. Section: Sorghum genotypes' grain yields. Delete the phrase "In the 2020 cropping season." ✔ We have deleted the phrase from the manuscript. Section: Sorghum genotypes' grain yields (second paragraph). The phrase "The ten frequently evaluated genotypes…" should be revised. The term "frequently" is misleading because the genotypes were evaluated only once in this study. ✔ We agree and have removed the word "frequently" , revising the sentence accordingly. Table 4: Correlation between weather variables and anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi. The weather data for the two districts are different. Please analyze and present them separately. ✔ We appreciate the suggestion. However, since weather data was only available for Assosa district and not for Bambasi district, a separate analysis is not possible. Instead, we have revised the table title to specify that the correlation analysis pertains only to Assosa district. Regarding the term "frequently tested genotypes" , it was intended to indicate that these six sorghum genotypes were evaluated over two cropping seasons at Jimma. This revised response is clear, concise, and professional, addressing all reviewer comments effectively. Let me know if you need any further refinements! Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is USAID (United States Agency for International Development) , and we have corrected it accordingly. Paragraph 2, last lines. The term foliar is not appropriate for indicating the phonological growth stage of the crop; it refers to above-ground plant parts at different stages. Did you mean vegetative stage ? Please clarify. ✔ Yes, this was a typographical error. The correct term is flowering stage , not foliar stage . We have revised it accordingly. Paragraph 4, third line. The application of biocontrol methods was suggested by Michereff et al. (1994) for anthracnose management. This reference is outdated and does not reflect current advancements in biocontrol methods. Please replace it with a more recent source. ✔ We agree and have replaced the reference with the following updated statement: "Biological control using antagonistic organisms such as Trichoderma species, Pseudomonas syringae , and Pseudomonas chlororaphis has been extensively studied due to their characteristics, including fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, and production of antibiosis (Khan et al., 2018; Sharma et al., 2019)." Materials and Methods Description of sorghum genotypes: It would be beneficial to provide a table detailing the genotypes, including the year of release, the center that released them, their source, and their anthracnose reaction at the time of release. ✔ We appreciate this suggestion and have now included the following table in our manuscript: Table 1. Sorghum varieties with their crop passport S.N Variety name Pedigree Name Year of Release Disease Reaction Altitude Yield (q/ha) Seed Source Research Center Farmers Field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Source: MOA and BARC Where: HR*= Highly Resistant under greenhouse, HS= Highly Susceptible, MR =Moderately Resistant, R= Resistant, S = Susceptible and - = no information Results First paragraph, last lines: The phrase "This showed that the seven…" – Why mention seven genotypes when ten were evaluated? What is the reference point for identifying genotypes with disease reduction? ✔ As indicated in Table 2 , only seven genotypes ( excluding Baco Striga, Mersa-1, and SC748-5 ) showed severity reduction at Bambasi compared to Assosa district. This is why we referred to seven genotypes rather than ten. Section: Sorghum genotypes' agronomic characteristics. Delete the phrase "In the 2020 cropping season." Since the study covers only one year, this phrase is unnecessary. The methodology section already mentions that the experiment was conducted in 2020. ✔ We accept the comment and have deleted "In the 2020 cropping season" from the manuscript. Section: Components of sorghum genotypes related to yield. Delete the phrase "In the 2020 cropping season." ✔ We have removed this phrase as suggested. Section: Sorghum genotypes' grain yields. Delete the phrase "In the 2020 cropping season." ✔ We have deleted the phrase from the manuscript. Section: Sorghum genotypes' grain yields (second paragraph). The phrase "The ten frequently evaluated genotypes…" should be revised. The term "frequently" is misleading because the genotypes were evaluated only once in this study. ✔ We agree and have removed the word "frequently" , revising the sentence accordingly. Table 4: Correlation between weather variables and anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi. The weather data for the two districts are different. Please analyze and present them separately. ✔ We appreciate the suggestion. However, since weather data was only available for Assosa district and not for Bambasi district, a separate analysis is not possible. Instead, we have revised the table title to specify that the correlation analysis pertains only to Assosa district. Regarding the term "frequently tested genotypes" , it was intended to indicate that these six sorghum genotypes were evaluated over two cropping seasons at Jimma. This revised response is clear, concise, and professional, addressing all reviewer comments effectively. Let me know if you need any further refinements! Competing Interests: The authors have no computing interests Close Report a concern COMMENT ON THIS REPORT Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 28 Oct 2024 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 2 (revision) 17 Mar 25 read read Version 1 28 Oct 24 read Ararsa Leta , Ambo University, Ambo, Ethiopia Temesgen Zewotir , University of KwaZulu Natal, KwaZulu-Natal, South Africa Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Zewotir T. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 09 Jun 2025 | for Version 2 Temesgen Zewotir , University of KwaZulu Natal, KwaZulu-Natal, South Africa 0 Views copyright © 2025 Zewotir T. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The paper is well motivated and well written. The data and the analysis is well executed. The analysis provide excellent insight about disease progress rate, yield-related trait, sorghum grain yield, and mean severity index at the two research stations: the Bambasi district and Assosa district. Occasionally the authors tend to compare and draw firm conclusion between the two stations results without statistical significance test. Describing the two station results is perfectly acceptable but comparing drawing a conclusion should be done with appropriate statistical test. Accordingly I suggest the authors to be cautious of this. Secondly the authors indicated they used SAS software for their analysis, it would be useful to state which SAS procedure they have used for each analysis.. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Partly Are all the source data underlying the results available to ensure full reproducibility? Partly Are the conclusions drawn adequately supported by the results? Yes Competing Interests No competing interests were disclosed. Reviewer Expertise Statistics I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Zewotir T. Peer Review Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r381619) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-381619 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Leta A. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 24 Mar 2025 | for Version 2 Ararsa Leta , Ambo University, Ambo, Oromia, Ethiopia 0 Views copyright © 2025 Leta A. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions I appreciate the authors' efforts in addressing the reviewer comments and making substantial improvements to the manuscript. The incorporation of additional data in Table 1, the refinements in text clarity, and the adjustments to table numbering have significantly enhanced the overall quality and readability of the study. The revisions effectively strengthen the manuscript’s conclusions and provide a clearer presentation of the findings. Based on these improvements, I find the revisions to be appropriate and sufficient. Competing Interests No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Leta A. Peer Review Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.178969.r371384) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/13-1290/v2#referee-response-371384 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Leta A. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 03 Mar 2025 | for Version 1 Ararsa Leta , Ambo University, Ambo, Oromia, Ethiopia 0 Views copyright © 2025 Leta A. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (1) Approved With Reservations info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Introduction paragraph 1, the last citation. (USAD 2012) Do You mean USAID? Please check. paragraph 2, the last lines. The term foliar; The term is not appropriate to indicate the phonological growth stage of the crop; it is simply the above ground plant part at different stages. Do you mean vegetative stage? Please correctly indicate . paragraph 4, 3 rd line. The application of biocontrol methods has been suggested by Michereff et al. (1994) as a potential remedy for anthracnose management. Too old to reflect the current advancement and reality of the potential of biocontrol method for this pathogen. Please replace with recent one. Materials and methods In materials for the experiment. Sartu, ACC-BRC-18, BRC-378, ACC-BRC-5, BRC-245, BTx623, SC748-5, Assosa-1, and Mersa-1. It is good if there is a table for detail description of the genotypes including their year of release, center released the varieties, source of the material and anthracnose reaction at time of release. Results In the 1 st paragraph last lines. This showed that the seven …. Why seven? While you evaluate ten genotype? What is you reference point to say genotype show disease reduction? In section Sorghum genotypes' agronomic characteristics. Delete the phrase ‘In the 2020 cropping season’, Since your data is one year data no need to mention the year hear, and you already mentioned the experiment is done in 2020 in methodology In section Components of sorghum genotypes related to yield. Delete the phrase ‘In the 2020 cropping season’ In section Sorghum genotypes' grain yields. Delete the phrase ‘In the 2020 cropping season’ In section Sorghum genotypes' grain yields 2 nd paragraph. The ten frequently…. Delete term frequently, the genotypes are once evaluated in the current study , The nine sorghum genotypes'….. Delete frequently. The genotypes are once evaluated in the current study Table 4. The correlation coefficient between weather variables and the sorghum anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi, was measured at weekly intervals. - As the weather variables for the two districts were different please do the analysis separately and present the table for each district Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above. reply Respond to this report Responses (1) Author Response 17 Mar 2025 Binyam Tsedaley, Plant Science, Assosa University, Asosa, Ethiopia Response to Reviewer Introduction Paragraph 1, last citation (USAD 2012). Do you mean USAID? Please check. ✔ Yes, it was a typographical error. The correct citation is USAID (United States Agency for International Development) , and we have corrected it accordingly. Paragraph 2, last lines. The term foliar is not appropriate for indicating the phonological growth stage of the crop; it refers to above-ground plant parts at different stages. Did you mean vegetative stage ? Please clarify. ✔ Yes, this was a typographical error. The correct term is flowering stage , not foliar stage . We have revised it accordingly. Paragraph 4, third line. The application of biocontrol methods was suggested by Michereff et al. (1994) for anthracnose management. This reference is outdated and does not reflect current advancements in biocontrol methods. Please replace it with a more recent source. ✔ We agree and have replaced the reference with the following updated statement: "Biological control using antagonistic organisms such as Trichoderma species, Pseudomonas syringae , and Pseudomonas chlororaphis has been extensively studied due to their characteristics, including fast competition, parasitism, plant root colonization, induced systemic resistance, plant growth promotion, and production of antibiosis (Khan et al., 2018; Sharma et al., 2019)." Materials and Methods Description of sorghum genotypes: It would be beneficial to provide a table detailing the genotypes, including the year of release, the center that released them, their source, and their anthracnose reaction at the time of release. ✔ We appreciate this suggestion and have now included the following table in our manuscript: Table 1. Sorghum varieties with their crop passport S.N Variety name Pedigree Name Year of Release Disease Reaction Altitude Yield (q/ha) Seed Source Research Center Farmers Field 1 Aba-Melko Sartu 2001 R 75 50 JARC 2 Chemeda ACC-BRC-18 2013 MR 1500-1900 32 25 BARC 3 Dano BRC-378 2006 MR 1500-1900 40-50 30-48 BARC 4 Gemedi ACC-BRC-5 2013 MR 1500-1900 33 28 BARC 5 Lalo BRC-245 2006 MR 1500-1900 40-52 35-48 BARC 6 Universally Susceptible BTX623 - HS - - - MARC 7 - PI570726 - HR * - - - MARC 8 - SC748-5 - HR * - - MARC 9 Assosa-1 - Under seed multiplication - - - - Assosa University 10 Local Chuck - - - - - - - Source: MOA and BARC Where: HR*= Highly Resistant under greenhouse, HS= Highly Susceptible, MR =Moderately Resistant, R= Resistant, S = Susceptible and - = no information Results First paragraph, last lines: The phrase "This showed that the seven…" – Why mention seven genotypes when ten were evaluated? What is the reference point for identifying genotypes with disease reduction? ✔ As indicated in Table 2 , only seven genotypes ( excluding Baco Striga, Mersa-1, and SC748-5 ) showed severity reduction at Bambasi compared to Assosa district. This is why we referred to seven genotypes rather than ten. Section: Sorghum genotypes' agronomic characteristics. Delete the phrase "In the 2020 cropping season." Since the study covers only one year, this phrase is unnecessary. The methodology section already mentions that the experiment was conducted in 2020. ✔ We accept the comment and have deleted "In the 2020 cropping season" from the manuscript. Section: Components of sorghum genotypes related to yield. Delete the phrase "In the 2020 cropping season." ✔ We have removed this phrase as suggested. Section: Sorghum genotypes' grain yields. Delete the phrase "In the 2020 cropping season." ✔ We have deleted the phrase from the manuscript. Section: Sorghum genotypes' grain yields (second paragraph). The phrase "The ten frequently evaluated genotypes…" should be revised. The term "frequently" is misleading because the genotypes were evaluated only once in this study. ✔ We agree and have removed the word "frequently" , revising the sentence accordingly. Table 4: Correlation between weather variables and anthracnose severity (PSI) at two districts in Western Ethiopia, Assosa and Bambasi. The weather data for the two districts are different. Please analyze and present them separately. ✔ We appreciate the suggestion. However, since weather data was only available for Assosa district and not for Bambasi district, a separate analysis is not possible. Instead, we have revised the table title to specify that the correlation analysis pertains only to Assosa district. Regarding the term "frequently tested genotypes" , it was intended to indicate that these six sorghum genotypes were evaluated over two cropping seasons at Jimma. This revised response is clear, concise, and professional, addressing all reviewer comments effectively. Let me know if you need any further refinements! View more View less Competing Interests The authors have no computing interests reply Respond Report a concern Leta A. Peer Review Report For: Temporal and Spatial Dynamics of Anthracnose ( Colletotrichum sublineolum ) Disease on Selected Sorghum Genotypes at Assosa Zone, Western Ethiopia [version 2; peer review: 2 approved] . F1000Research 2025, 13 :1290 ( https://doi.org/10.5256/f1000research.171415.r366819) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. 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