BIOEFFICACY OF NEONICOTINOID INSECTICIDES AGAINST THRIPS PEST (Thrips palmi) ON GRAPE VINE (Vitis vinifera L.)
SUNIL KUMAR GHOSH *
Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India.
RAJIB KARMAKAR
Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India.
*Author to whom correspondence should be addressed.
Abstract
The grape thrips (Thrips palmi), has great importance that causing huge losses to commercial production of grapes (Vitis vinifera L.). It has become a serious pest of grape vine in West Bengal, India. The neonicotinoid insecticides viz. spinetoram 10% w/w + sulfoxaflor 30% w/w WG @ 100, 120 and 140 a.i. g /ha, spinetoram 12% SC w/v (11.7%w/w), sulfoxaflor 24% w/v (21.8% w/w) SC, emamectin benzoate 5% SG and buprofezin 25% SC @ 30, 90, 11 and 250 a.i. g /ha respectively were tested for their efficacy against thrips. Spinetoram 10% w/w + sulfoxaflor 30% w/w WG @ 140 g a.i./ha proved the most effective against thrips on grapes and it was at par with spinetoram 10% + sulfoxaflor 30% WG @ 120 g a.i./ha. Same trends have also been reflected in yield. The tested insecticides were also found safer to predators i.e. Menochilus sp., Syrphus sp. and Chrysoperla sp.
Keywords: Efficacy, insect growth regulator, predators, safe pesticides, thrips, yield