Testing the efficacy of different fungicides against Colletotrichum capsici under in vitro Conditions
The key crop for the global economy, the chilli (Capsicum annuum L.), is badly affected by fruit rot, which can reduce yields by up to 50%. The most popular method for controlling anthracnose is the use of chemical fungicides. Based on pathogenicity studies, isolate Cc-3 was recorded as the highest virulent with early and late symptoms on chilli fruit among 19 different isolates. Isolate Cc -3 was used for the study of the management of Colletotrichum capsici by evaluating different fungicides using poisoned food technique. The efficacy of different fungicides viz., carbendazim 50 % WP, captan 50% WP, copper oxy chloride 50 % WP, difeniconazole 25 % EC, tebuconazole 25.9 % EC, azoxystrobin 23 % SC, azoxystrobin 11 % + tebuconazole 18.3 % w/w SC, carbendazim 12 % + mancozeb 63 % WP, carbendazim 12 % + flusilazole 12.5 % SE, prochloraz 24.4 % + tebuconazole 12.15 % w/w EW, tebuconazole 50 % + trifoxystrobin 25 % WG, metiram 55 % + pyraclostrobin 5 % WG, picoxystrobin + tricyclazole 20.33 % w/w SC, hexaconazole 5 % + captan 70 % WP were tested against Colletotrichum capsici pathogen collected from pinapaka village of Khammam area under in vitro conditions. The results from in vitro studies on the different fungicides tested, the EC50/ ED50 (µg ml-1) values shown less in Tebuconazole 25.9 % EC (18) followed by difenoconazole 25 % EC (115), carbendazim 12 % + mancozeb 63 % WP (316), hexaconazole 5 % + captan 70 % WP (406), carbendazim 25 % + flusilazole 12.5 % SE (549), azoxystrobin 11 % + tebuconazole 18.3 % w/w SC (689) and prochloraz 24.4 % + tebuconazole 12.1 % w/w EW (762). Minimum Inhibitory Concentration (MIC) was recorded lowest in tebuconazole 25.9 % EC (100 µg ml-1) followed by difenoconazole 25 % EC (250 µg ml-1) and highest was recorded in azoxystrobin 23 % SC (3500 µg ml-1) among all the six individual fungicides. Minimum Inhibitory Concentration (MIC) was recorded lowest in carbendazim 12 % + mancozeb 63 % WP (1000 µg ml-1) followed by hexaconazole 5 % + captan 70 % WP (1250 µg ml-1) and highest was recorded in tebuconazole 50 % + trifloxystobin 25 % WG (4000 µg ml-1) among all eight combination fungicides.