In vitro efficacy of ready mix fungicides against Rhizoctonia solani kühn causing root rot of coriander

The efficacy of different ready mix fungicides tested under in vitro condition was capable of inhibiting the mycelial growth of Rhizoctonia solani Kuhn at various concentrations as compared to control. Tebuconazole 50% + tryfloxistrobin 25% WG gave significantly the maximum mean mycelial growth inhibition (76.46 per cent). The next best was metiram 55% + pyraclostrobin 5% WG with mean mycelial growth inhibition of 58.33. Whereas, cymoxanil 8% + mancozeb 64% WP was the least effective ready mix fungicide with 4.43 per cent mean mycelial growth inhibition under laboratory condition. The effect of different concentrations of ready mix fungicides on sclerotial formation was found negatively correlated with the inhibition of growth. No sclerotial formation was found in tebuconazole 50% + trifloxystrobin 25% WG at 250, 500 and 1000 ppm concentration as well as in metiram 55% + pyraclostrobin 5% WG and carbendazim 12% + mancozeb 63% WP at 500 and 1000 ppm and carboxin 37.5% + thiram 37.5% WP at 1000 ppm. Abundant sclerotial formation was found in all concentration of cymoxanil 8% + mancozeb 64% WP and hexaconazole 4% + zineb 68% WP in vitro.