In vitro evaluation of fungicides efficacy against Rhizoctonia solani causing root rot of chilli

Abstract

Chilli (Capsicum annuum. L.) is an important commercial crop of India, where Rhizoctonia spp. causes the most devastating root rot disease with severe loss in yield each year. An experiment was conducted in 2023-24 in which the efficacy of fungicides against Rhizoctonia spp. was evaluated. Among 11 fungicides tested, Tebuconazole 25.9% W/W, Mancozeb 75% WP, Carbendazim 50% WP, Thiophanate methyl 70% WP and Carbendazim 12% + Mancozeb 63% WP were found to be most effective with complete (100%) inhibition of mycelial growth of pathogen at all concentrations i.e., (0.1%, 0.2% and 0.3%), respectively. The minimum inhibitions were recorded by Tetraconazole 3.8% W/W (54.82%, 67.31% and 75.27%) followed by Azoxystrobin 23% SC (33.88%, 64.07% and 80.38%) at all concentration (0.1%, 0.2% and 0.3%), respectively.