Efficacy of fungicides and bioagents on Colletotrichum gloeosporioides causing blight in Piper longum.

The Colletotrichum blight affect number of fields of Piper longum and thus management of this disease in vitro and in vivo was under taken. Among chemicals mancozeb + carbendazim (@ 0.2%) was found most effective to inhibit 96.26 per cent growth followed by carbendazim (@ 0.1%) (68.34%), mancozeb (@ 0.25%) (67.51%) and copper oxychloride (@ 0.3%) 64.88%). Amongst bioagents Trichoderma viride was found effective to inhibit the growth of pathogen upto 70.42 per cent, in field experiment spraying of mancozeb + carbendazim (@ 0.2%) was found effective in reducing disease intensity (18.70%) with 33.38 per cent disease control followed by carbendazim (@ 0.1%) (19.38%), copper oxychloride (@ 0.3%) (19.62%) and Trichoderma viride (6 × 107 CFU/ml) with 20.08 % disease intensity having 30.95, 30.10 and 28.46 per cent disease control.