Comparative Bioefficacy of Neonicotinoid, Synthetic Pyrethroid and Their Mixture (Alika) Against Stemfly Infestation in Soybean

Soybean, Glycine max (L.) Merrill is a species of legume native to East Asia, the plant is classed as an oilseed rather than a pulse. The low productivity of this legume crop in India is attributed to variety of limiting factors, of which insect-pest and disease are most important. Soybean is attacked by 273 insect pests, hampering the crop production. Thus it is necessary to control insect pests of soybean. An estimated 4, 000ha of soybean near casino in North NSW have been affected to varying degree by stem fly.(Charleston, 2013) The present investigation was carried out at Norman E. Borlaug Crop Research Centre, G.B. pant University of Agriculture and Technology, Pantnagar during 2011. In the present experiment we used different new insecticides viz. Thiamethoxam12.6+ Lambdacyhalothrin 9.5%ZC (Alika 247ZC) @ 22g ai/ha, Thiamethoxam12.6+ Lambdacyhalothrin 9.5%ZC (Alika 247ZC) @ 27.5g ai/ha, Thiamethoxam12.6+ Lambdacyhalothrin 9.5%ZC (Alika 247ZC) @ 33g ai/ha, Thiamethoxam 25% WG Lambdacyhalothrin 49%CS, Ethion 50%EC, Imidachloprid17.8%SL, check against stem fly infestation. Result shows that percent tunnelling was least in Alika247zc @ 33g ai/ha about 30.55% as compared to 42.32% in untreated plot. The percent infestation was 93% in Alika247zc @ 33g ai/ha as compared to 100% in untreated plot.