Vol. 11, Issue 9 (2022)

Author(s):
Anusree KP and Kanzaria KK

Abstract:
Powdery mildew caused by Erysiphe polygoni DC is a common constraint prevalent in Saurashtra region of Gujarat especially during late Kharif season. Considering the moderate to severe losses in yield caused by the disease, it is very necessary to have some information on effective fungicides for the management of the disease under field condition. In this context, an experiment was conducted at the Research Farm of the Department of Plant Pathology, College of Agriculture, JAU, Junagadh during Kharif 2021 to evaluate the efficacy of different fungicides for the management of powdery mildew disease of black gram. The results indicated that, two sprays of captan 70% + hexaconazole 5% WP at 0.15 per cent concentration first at initial appearance of symptoms and thereafter at twelve days interval remained the most effective treatment with minimum per cent disease intensity (18.12%), maximum disease control (74.49%), maximum seed yield (1238 kg/ha) and 80.20 per cent yield increase over control followed by wettable sulphur 80% WP (20.15 and 1216), hexaconazole 5% EC (21.20 and 1184), kresoxim-methyl 15% + chlorothalonil 56% WG (23.58 and 1108) and propiconazole 25% EC (24.50 and 1058), respectively with per cent disease intensity and seed yield kg/ha. Further, it was also revealed that the loss in seed yield of black gram due to powdery mildew disease was 35.18 per cent when no any control measures are adopted. Whereas, water sprayed control treatment exhibited avoidable yield loss of 5.40 per cent.