Author(s): RK Ranjan, Dinesh Rai and Abbas Ahmad

Abstract: Bipolaris oryzae L. causing brown leaf spot of rice is the important diseases occurring in India. Field experiment was conducted in Randomized Block Design (RBD) with four replications to assess the efficacy of different available fungicides in the market against brown leaf spot of rice at the research farm of RPCAU, Pusa, Bihar, India. The seven selected different fungicides i.e. Difenoconazole 25% EC, Isoprothiolane 40% EC, Kasugamycin 3% SL, Kitazin 48% EC, Propineb 70% WP, Tebuconazole 25.9% EC and Thifluzamide 24% SC were compared with control. Among seven fungicides evaluated, under field condition foliar spray with Difenoconazole 25% EC (0.5 ml/l) recorded lowest disease severity (14.75%) and highest yield (41.68 q/ha) followed by Tebuconazole 25.9% EC (1.5 ml/l) 19.63% & 40.25 q/ha, Thifluzamide 24% SC 22.88% & 39.13 q/ha disease severity and yield respectively. The lowest disease severity and yield was recorded in Kasugamycin 3% SL 33.0% & 36 q/ha as compare to control 46.25% & 32.50 q/ha respectively. Difenoconazole 25% EC (0.5 ml/l) and Tebuconazole 25.9% EC (1.5 ml/l) proved most effective and reduced the leaf spot severity from 46.25% to 14.75 & 19.63% respectively along with significant increase in grain yield of rice from 32.50 q/ha to 41.68 q/ha & 40.25 q/ha respectively as compare to control disease severity 46.25% and yield 32.50 q/ha.

DOI: 10.33545/26174693.2024.v8.i3k.860