Field evaluation of fungicides for management of Alternaria leaf blight in cotton

Abstract

Field study was carried out to know the effect of nine different fungicides for minimize intensity of Alternaria macrospora. The hexaconazole 5% + captan 70% WP (0.1%) was the most effective fungicide with 16.49 percent mean disease intensity. The second effective treatment was hexaconazole 5% EC (0.01%) with 20.01 percent mean disease intensity, propiconazole 25% EC (0.1%) was found effective with 20.96 percent mean disease intensity. Highest seed cotton yield was recorded in treatment of hexaconazole 5% + captan 70% WP at 0.1% (2346 kg/ha), which was at par with carbendazim 12% + mancozeb 63% WP at 0.15% (2211 kg/ha). Minimum yield was recorded in control (1490 kg/ha). Maximum avoidable yield loss of 36.49 percent was recorded in treatment hexaconazole 5% + captan 70% WP at 0.1%. Minimum 15.05 percent avoidable yield loss recorded in treatment chlorothalonil 75% WP at 0.1%.