The importance, pathogen identification and chemical control of brown leaf spot disease of rice caused by Bipolaris oryzae

The importance, pathogen identification and chemical control of brown leaf spot disease of rice caused by Bipolaris oryzae | 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 The importance, pathogen identification and chemical control of brown leaf spot disease of rice caused by Bipolaris oryzae Isaac Bedu, Seloame Tatu Nyaku, Christiana Amoatey, Joseph Okani Honger This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7848056/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 15 You are reading this latest preprint version Abstract Brown spot disease destroys rice plants in the field. While symptoms of the disease have been observed in the irrigated rice producing areas of Ghana, information about its importance and etiological agent is scant. In this study, field surveys were carried out in 11 major districts, where irrigated rice is grown in Ghana and the disease incidence and severity were determined. The causal agent was isolated and identified, using its cultural and morphological characters, complemented with the sequence analysis of the internal transcribed spacer region and the glyceraldehyde-3-phosphate dehydrogenase gene. After that six different types of fungicides were evaluated against the disease in the field. The disease prevalence 100% in the study area, with disease incidence ranging from 86.7% to 100% and severity ranging from 24.67 to 57.61%, among the districts surveyed in 2 successive years. The fungus B. oryzae was confirmed as the causal agent of the disease. Copper based fungicides (Cuprofix disperss, Coprous super and Curenox), botanicals (Ex-icute and Supramino 999) and an inorganic fungicide (Mirage), controlled the disease, and increased yield of rice. Rice brown spot Bipolaris oryzae internal transcribed spacer region glyceraldehy-3-phosphate dehydrogenase gene Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 06 Jan, 2026 Reviewers agreed at journal 05 Jan, 2026 Reviews received at journal 04 Jan, 2026 Reviews received at journal 03 Jan, 2026 Reviews received at journal 31 Dec, 2025 Reviewers agreed at journal 26 Dec, 2025 Reviewers agreed at journal 25 Dec, 2025 Reviewers agreed at journal 25 Dec, 2025 Reviewers agreed at journal 10 Dec, 2025 Reviewers agreed at journal 10 Dec, 2025 Reviewers invited by journal 08 Dec, 2025 Editor invited by journal 27 Nov, 2025 Editor assigned by journal 24 Nov, 2025 Submission checks completed at journal 28 Oct, 2025 First submitted to journal 28 Oct, 2025 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-7848056","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":558441384,"identity":"6a763e12-6c08-48e5-bf25-f828de87d918","order_by":0,"name":"Isaac Bedu","email":"","orcid":"","institution":"University of Ghana","correspondingAuthor":false,"prefix":"","firstName":"Isaac","middleName":"","lastName":"Bedu","suffix":""},{"id":558441399,"identity":"5c755cde-3dd5-4b19-89e4-f1e334a4b1e2","order_by":1,"name":"Seloame Tatu Nyaku","email":"","orcid":"","institution":"University of 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