Management of Downy Mildew of Grapes by New Combination Fungicide Oxathiapiprolin 0.6% + Mancozeb 60% Wg in India

Abstract

Downy mildew of grapes caused by Plasmopara viticola is the most important disease of grapes which is observed in all grape growing regions of India. A new fungicide Oxathiapiprolin (piperidinylthiazoleisoxazoline class) along with Mancozeb (ethylene-bis-dithiocarbamate) was evaluated against downy mildew of grapes in the year 2018-19 and 2019-20 under field conditions at Maharashtra. Three concentrations of Oxathiapiprolin 0.6% + Mancozeb 60% WG, i.e. 1666, 2500 and 3333 g/ha were checked in the experiment. Pooled data revealed that the test fungicide@ 3333 g/ha manifested lowest PDI of 11.25 with a corresponding yield of 22.99 t/ha and it was at par with @2500 g/ha which had a PDI of 12.13 and yield of 22.31 t/ha. Hence the treatment Oxathiapiprolin 0.6% + Mancozeb 60% WG @ 3333 g/ha may be recommended against downy mildew of grapes.