Bio-efficacy of different fungicides in managing blast of rice caused by Pyricularia grisea

In vitro evaluation of different fungicides indicated that tebuconazole proved most effective as it completely inhibited the colony growth of P.grisea at 10 μg/ml whereas azoxystrobin + difenconazole, propiconazole and difenconazole completely inhibited the colony growth of the pathogen at 25 μg/ml. rest of fungicides viz. zineb, tricyclazole, kasugamycin and azoxystrobin proved least effective even at a concentration of 200 μg/. under pot culture conditions, tebuconazole @ 0.1 per cent was found to be highly effective in reducing leaf blast severity followed by propiconazole @ 0.1 per cent. Under field conditions, the efficacy of propiconazole, tricyclazole, tebuconazole and azoxystrobin + difenconazole was at par and proved to be effective fungicides in reducing the leaf and neck blast severity and increasing the yield.