Evaluation of Different Treatments on the Management of Black Gram Powdery Mildew Disease Caused by Erysiphe Polygoni (De Candolle)

Abstract

Black gram (Vigna mungo L.), is one of the most important short duration pulse crops grown in India. Powdery mildew caused by Erysiphe polygoni is a major destructive disease causing drastic economic yield loss upto 50 per cent. In this present study to evaluation of different treatments on the management of powdery mildew on Black gram. Among five mangrove species tested, the leaf extract of Rhiphora apiculata out performed well recording maximum inhibition of conidial germination. In case of fungicides, Azoxystrobin @ 0.1% significantly reduced the conidial germination. The bio-agent Ampelomyces quisqualis was found to be effective at 0.5 per cent concentration against the pathogen. The susceptible variety ADT-3 was raised in both pot and field for management practices. The treatment involving combination of bio-agent and botanical i.e., foliar spraying of A. quisqualis @ 0.5% on 43 DAS AND 53 DAS + foliar spraying of R. apiculata @ 15% on 43 DAS+ 53 DAS recorded minimum per cent disease index in both pot (18.94 %) and field trial (14.50%). The synergistic effect of A. quisqualis and R. apiculata significantly reduces the disease incidence and considerably improve the biometric of blackgram in both pot and field trials are approximately equal to fungicide application.