Comparative efficacy of fungicides and bioagents for the management of powdery mildew in black gram

Abstract

Powdery mildew caused by Erysiphe polygoni is one of the most widely spread and destructive disease of black gram (Vigna mungo L. Hepper). The present investigation on ‘‘Epidemiological studies on powdery mildew of black gram caused by Erysiphe polygoni DC’’ was undertaken during Kharif season 2024-2025. In field experiments, among different fungicides Cyflufenamid 5% EW @ 1 mL/L of water, was found significantly most effective followed by Azoxystrobin 5.1% w/w + Tebuconazole 9.1% w/w + Prochloraz 18.2% w/w EC and Penconazole 10% EC, achieving a maximum disease control rate of 80.90 percent over the untreated control. Additionally, among bioagents Ampelomyces quisqualis @ 2 mL/L of water, was found most effective followed by Trichoderma harzianum, and Bacillus subtilis, resulting in a disease control rate of 54.26 percent over the untreated control.