International Journal for Asian Contemporary Research, 5(2): 24-30
Field Evaluation of BRRI Boro Rice Varieties for Resistance to Sheath Blight
Received: 26 May, 2025 || Accepted: 30 June, 2025 || Published: 05 July 2025
A B S T R A C T
The experiment was conducted using a Randomized Complete Block Design (RCBD) with three replications per treatment. An isolate of Rhizoctonia solani anastomosis group AG1 from Bangladesh was used for artificial inoculation at the maximum tillering stage of the crop. Significant variation in sheath blight (ShB)-related parameters among the tested varieties indicated the presence of genetic diversity. Based on their responses to sheath blight, the varieties BR1, BR6, BR14, BRRI dhan45, and BRRI dhan50 were classified as susceptible (S), whereas BRRI dhan27 was identified as resistant (R). Grain sterility in healthy hills ranged from 10.7% to 58.1%, while in diseased hills, it ranged from 11.9% to 64.9%. A positive correlation was observed between relative lesion height (RLH) and grain sterility (%). Grain yield per hill ranged from 4.2 to 6.7 g in healthy hills and from 2.9 to 5.3 g in diseased hills. An increase in RLH (%) was associated with a decrease in grain yield per hill compared to healthy plants, also showing a positive relationship between disease severity and yield loss.
Keyword: Rice, sheath blight, LDA, RLH and grain yield.
Copyright information: Copyright © 2025 Author(s) retain the copyright of this article. This work is licensed under a Creative Commons Attribution 4.0 International License
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