Bio-efficacy of some newer insecticides against spotted POD borer Maruca vitrata in pigeonpea under field conditions

Abstract

The present study was conducted at the Research cum Instructional Farm, IGKV, Raipur, Chhattisgarh during Kharif season 2013-2014.The bioefficacy of eight newer insecticidal molecules, acetamiprid 20SP @ 20g a.i/ha, indoxacarb 14.5SC @ 50g a.i/ha, acephate 75SP @ 750g a.i/ha, spinosad 45SC @ 73g a.i/ha, emamectin benzoate 5WSG @ 9.5g a.i/ha, flubendiamide 20WG @ 50g a.i/ha, rynaxipyr 18.5SC @ 30g a.i/ha and thiamethoxam 25WG @ 75g a.i/ha each at two sprays against spotted pod borer Maruca vitrata in pigeonpea were evaluated under field conditions including control as check. Management of gram pod borer by newer insecticides, among the treatments, the minimum pod damage of 5.13% was recorded with spinosad which was at par with indoxacarb (5.50%) and emamectin benzoate (5.66%). The maximum pod damage of 8.53% was recorded in flubendiamide. Pod damage by M.vitrata recorded in untreated control was 11.10%. Among the treatments, the minimum grain damage (1.00%) was recorded with spinosad. However, the maximum grain damage of 3.20% was recorded with flubendiamide. The grain damage by M.vitrata recorded in untreated control was 5.33%.The highest grain yield (1360.54 Kg/ ha) was recorded in spinosad 45SC which was at par with indoxacarb 14.5SC (1207.48 kg/ha) emamectin benzoate 5WSG (1139.44 kg/ha) and acetamiprid 20SP (1122.44 kg/ha), while the lowest grain yield (1037.41 Kg /ha) was recorded in flubendiamide 20WG, and the untreated control resulted least (816.32 kg /ha) grain yield in comparison to newer insecticides treated plots.