Role of new fungicide Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) in the management of powdery mildew and anthracnose diseases in grapes.

Abstract

Grape is a fruit crop of commercial significance in the arena of Indian horticulture. Powdery mildew (c.o. - Erysiphe necator) and anthracnose (c.o. - Elsinoe ampelina/ Colletotrichum gloeosporioides) are the most important biotic constraints in grape. The combination fungicide Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) was evaluated for two seasons (2016-17 & 2017-18) in the vineyards of ICAR-National Research Centre for Grapes, Pune, Maharashtra against both the diseases. Different concentrations of Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) viz. 400, 500 and 600 ml/ha were compared with its component fungicides, Pydiflumetofen 7.5% and difenoconazole 12.5% w/v (200 SC) separately. Experimental results showed that Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) @ 600ml/ha manifested lowest pooled PDI of 10.00 in case of leaves and 10.31 in case of bunches respectively with a corresponding yield of 10.99 t/ha. The test fungicide was not phytotoxic to the grapevines up to the dose of 1200ml/ha. Against anthracnose, the pooled data showed that Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) @ 600 ml/ha as foliar spray showed lowest PDI of 10.81. Hence the treatment Pydiflumetofen 7.5% + difenoconazole 12.5% w/v (200 SC) @ 600 ml/ha was effective against powdery mildew as well as anthracnose.