Potential yield indices and economic estimation of some newer insecticides against pod borer complex of pigeonpea

Abstract

The present study was conducted at the Research cum Instructional Farm, IGKV, Raipur, Chhattisgarh during Kharif season 2013-2014. Economics 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 against pod borer complexof pigeonpeawere evaluatedincluding control as check. Spinosad maintained its lethal effect with least pod damage of 6.00% which was at par with indoxacarb (6.14%), whereas maximum pod damage of 10.03% was recorded with flubendiamide. Pod damage in untreated control was 11.30%.The minimum grain damageof 2.10% was recorded with spinosad and indoxacarb, which were at par with emamectin benzoate (2.63%), whereas the maximum grain damage of 4.26% was recorded in flubendiamide. Grain damage in untreated control was 5.40%. The highest grain yield (1360.54 Kg/ ha) was recorded in spinosad which was at par with indoxacarb (1207.48 kg/ha) emamectin benzoate (1139.44 kg/ha) and acetamiprid (1122.44 kg/ha), while the lowest grain yield (1037.41 Kg /ha) was recorded in flubendiamide, and the untreated control resulted least (816.32 kg /ha) grain yield.The highest incremental cost-benefit ratio was with spinosad (1:9.48) followed by indoxacarb (1:6.26), emamectin benzoate (1:5.43), acetamiprid (1:5.20), acephate(1:3.18), thiamethoxam (1:3.54) and rynaxipyr (1:2.75) while the lowest incremental cost-benefit ratio was with flubendiamide (1:1.89). Thus application of spinosad, indoxacarb, emamectin benzoate and acetamiprid proved to be the best regarding economic management of pod borers in pigeonpea.