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Black gram [Vigna mungo (L.) Hepper] is the most important grain legumes. It is from Fabaceae family with 2n=22 Chromosomes and it is believed to have originated in India (Chatterjee and Bhattacharya, 1986). Black gram cultivation is suitable for hot and moist weather condition where temperature remains between 25-35 o C. It is mainly a day neutral warm season crop commonly grown in semiarid to sub-humid low land tropics and subtropics (Mane et al., 2018). Powdery mildew of black gram incited by Erysiphe polygoni (De Candolle) is the major problem in black gram production; it causes both quantitative and qualitative losses of grains. This disease has been observed severe mainly in late sown kharif crop and remains active throughout the year. The powdery mildew disease interferes Powdery mildew of black gram incited by Erysiphe polygoni (De Candolle) is the major problem in black gram production; it causes both quantitative and qualitative losses of grains. In vitro experiment was conducted to evaluate the efficacy of different fungicides, botanical and organic amendments against powdery mildew of black gram caused by Erysiphe polygoni DC. Among all the fungicides new combi-fungicide Taspa 300 SC [Propiconazole (13.9%) 15% W/V + Difenconazole (13.9%) 15% W/V] significantly cause maximum 93.05, 92.1 and 89.23% inhibition of spore germination with minimum 5.32, 6.05 and 8.24 % spore germination at 0.2, 0.1 and 0.05% concentration. Among the botanical the Neem leaf extract was observed most effective with 28.32, 30.53, 32.85, 35.62 and 42.63% spore germination and 62.14, 59.18, 56.08, 52.38 and 43.01% inhibition of spore germination at 15, 10, 7, 5 and 2% concentration respectively and in the organic amendments Panchgavya was found most effective with 30.50, 32.15, 34.98, 39.36 and 45.51% spore germination and 59.22, 57.02, 53.24, 47.38 and 39.16% inhibition of spore germination at 15, 10, 7, 5 and 2% concentrations respectively. K e y w o r d s

In vitro Evaluation of Fungicides, Botanical and Organic Amendments against Erysiphe polygoni DC in Black Gram