Evaluation of Some Newly Evolved Fungicides against Helminthosporium oryzae, Alternaria padwickii, Fusarium moniliforme, Curvularia lunata and Sarocladium oryzae Causing Grain Discoloration Disease of Rice Under in vitro Condition

Grain discoloration disease of rice is gradually becoming a serious problem in rice cultivation and seed industry of West Bengal as well as all over India. Discolored rice seeds were collected from famers field at village Falta, South 24 pargana district, West Bengal. Five pathogens namely Helminthosporium oryzae, Alternaria padwickii, Fusarium moniliforme, Curvularia lunata and Sarocladium oryzae were isolated from diseased seed samples. Seven fungicides namely Trifloxystrobin25 % + Tebuconazole50 %WG, Pencycuron22.9 %SC, Thiafluzamide 24 %SC, Carbendazim25 % + Mancozeb 50 %WS, Tricyclazole18 % + Mancozeb 62 % WP, Tricyclazole75 % WP and Propiconazole13.9 %+ Difeconazole13.9 % EC were tested against these five pathogens under in vitro condition. Among these fungicides, five fungicides namely Trifloxystrobin 25 %+Tebuconazole50 %WG, Carbendazim25 %+ Mancozeb 50 %WS, Tricyclazole18 %+Mancozeb 62 % WP, Tricyclazole75 % WP, Propiconazole13.9 %+, Difeconazole13.9 % EC had shown complete inhibition of growth of all the test pathogens.