Assessing the Prevalence and Management of Chocolate Spot (Botrytis Fabae L.) of Faba Bean (Vicia Faba L.) Using Host Resistance and Fungicide Spray Frequencies in Dabat District, North Western Ethiopia

Assessing the Prevalence and Management of Chocolate Spot (Botrytis Fabae L.) of Faba Bean (Vicia Faba L.) Using Host Resistance and Fungicide Spray Frequencies in Dabat District, North Western Ethiopia | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Assessing the Prevalence and Management of Chocolate Spot ( Botrytis Fabae L.) of Faba Bean ( Vicia Faba L.) Using Host Resistance and Fungicide Spray Frequencies in Dabat District, North Western Ethiopia Dinku Atnafu Anega, Abaynew Jemal Jenber, Yehizbalem Azmeraw Tadele This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6556242/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Faba bean (Vicia faba L.) is one of the oldest domesticated food legumes, cultivated for over 5,000 years. It is a vital crop for farming communities, especially in Ethiopia, where it provides an essential source of food, income, and soil fertility. However, one of the major challenges faced by faba bean farmers is Chocolate Spot disease, caused by the fungal pathogen Botrytis fabae . This disease is a significant yield limiter, with losses reaching up to 68% in some regions of Ethiopia. To address this issue, a study was conducted in the Dabat district of the South Gondar Administrative Zone during the 2022/2023 cropping season. The primary goal was to assess integrated management strategies for controlling Chocolate Spot in faba bean. The experiment involved three faba bean varieties—Local, Walki, and Hachalu—and four fungicide spraying frequencies (unsprayed, one-time spray, two-time spray, and three-time spray). The fungicide used was Trust Cymocop 439.5% WP, applied at a rate of 1.5 kg/ha. A randomized complete block design with three replications was employed, and the results revealed significant interactions between the variety of faba bean and the frequency of fungicide spraying. The study found that the Walki variety, when sprayed three times with the fungicide, exhibited the lowest disease severity at 25.33%, compared to the Local variety, which had the highest severity at 52.33% when left unsprayed. The Area under Disease Progress Curve (AUDPC) was also significantly lower in Walki with three sprays (573%-unit day), suggesting that fungicide application coupled with resistant varieties can effectively manage Chocolate Spot disease. This research highlights the importance of using resistant varieties and appropriate fungicide application to control Chocolate Spot disease and improve faba bean yields. However, to strengthen these findings, further research is recommended over multiple cropping seasons. Mycology AUDPC Chocolate spot disease assessment faba bean incidence Full Text Additional Declarations The authors declare potential competing interests as follows: Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6556242","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":449696246,"identity":"79959903-8ffc-4028-a585-f7b428e0bef4","order_by":0,"name":"Dinku Atnafu Anega","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA70lEQVRIiWNgGAWjYDCCwwzMEAbzAcYHH4A0GztxWgyAShOYDWeAtDAT0nIAoYVNmAdsHQEdfMd5Dxvz1PzJ42/jMWO2+bVNno+ZgfHDxxzcWiQP8yUn8xwzKJY4xmP2OLfvtmEbMwOz5MxtuLUYHOYxPszDZpDYcL/H3Di35zYjUAsbMy9BLf8MEucDbZG27LltT5SWZN42g8QNIC0MP24nEtQiCdRiOLfPOHHjMbZiw96G28ltzIzNeP3Cd/6MscSbb3KJ844xb3zw489t2/ntzQc/fMSjBRUwtoHJBmLVg8AfUhSPglEwCkbBSAEAwaVNR43mcmwAAAAASUVORK5CYII=","orcid":"","institution":"Department of Plant Sciences, Dilla University, Ethiopia, P. 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It is a vital crop for farming communities, especially in Ethiopia, where it provides an essential source of food, income, and soil fertility. However, one of the major challenges faced by faba bean farmers is Chocolate Spot disease, caused by the fungal pathogen \u003cem\u003eBotrytis fabae\u003c/em\u003e. This disease is a significant yield limiter, with losses reaching up to 68% in some regions of Ethiopia. To address this issue, a study was conducted in the Dabat district of the South Gondar Administrative Zone during the 2022/2023 cropping season. The primary goal was to assess integrated management strategies for controlling Chocolate Spot in faba bean. The experiment involved three faba bean varieties—Local, Walki, and Hachalu—and four fungicide spraying frequencies (unsprayed, one-time spray, two-time spray, and three-time spray). The fungicide used was Trust Cymocop 439.5% WP, applied at a rate of 1.5 kg/ha. 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