Studies on bio-rational insecticides against tobacco caterpillar, Spodoptera litura on groundnut crop in Chhattisgarh

Abstract

The field experiment were conducted at Research Cum Instructional Farm at IGKV, Raipur (C.G.) during kharif 2018, for the purpose to evaluate relative efficacy of bio-rational insecticides against tobacco caterpillar, Spodoptera litura infesting groundnut. Based on two spray, it was concluded that the Emmamectin benzoate 5 SG (0.0025%, 0.5 gm/lit.) and Spinosad 45 SC (0.014%, 0.31 ml/lit.) were found superior from rest of the insecticides. The experimental results indicated that the Emmamectin benzoate 5 SG (0.0025%, 0.5 gm/lit.) against the tobacco caterpillar, S. litura was found to be most effective chemical treatment because it recorded the highest per cent mortality of the larvae (65.52%). The second best treatment was Spinosad 45 SC (0.014%, 0.31 ml/lit.) with 61.91% mortality followed by Pymetrozine 50 WDG (58.35%), Buprofezin 25 SC (57.45%), Pyriproxyfen 10 EC (55.31%), Azadirachtin 1500 ppm (36.32%), Metarhizium anisopliae (34.90%) and Beaveria bassiana (28.16%). The Beaveria bassiana (2.04 x 106, 10 ml/lit.) was seen the least effective treatment as compared to other as, it was observed least per cent mortality of the larvae.