Efficacy of Synthetic Insecticides against Pod Borer [Helicoverpa armigera (Hubner)] on Cowpea [Vigna unguiculata (L.) Walp]

The present investigation was conducted at Central Research Field, Department of Entomology, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj during the Kharif season of 2021. The field was laid in randomized block design (RBD) with six treatments Chlorantraniliprole 18.5% SC 0.5ml/L, Spinosad 45SC 1ml/L, Emamectin benzoate 5%SG 0.04G/Kg, Neem oil 5% 50ml/L, karanj oil 5% 50ml/L, NSKE 5% 50ml/L and control viz., The larval population per plant was taken before spraying and 3,7 and 14 days after each spray all the insecticides tested significantly reduced the pest infestation compared to control. The results of the efficacy showed that the minimum larval population was recorded in the treatment Chlorantraniliprole 18.5% SC (2.26%, 1.80%). The next effective treatments were Spinosad 45SC (2.80%, 2.23%), Emamectin benzoate 5%SG (3.23%, 2.80%), Neem oil 5% (3.63%, 3.30%), karanj oil 5% (4.20%, 3.60%.), NSKE 5% (4.56%, 4.10%.), which was found to be least effective among all treatments. The best and most economical treatment Chlorantraniliprole 18.5% SC (1:2.82) followed by Spinosad 45 SC (1:2.44), Emamectin benzoate 5% SG (1:2.10), Neem oil 5% (1:1.92), karanj oil 5% (1:1.68), NSKE (1:1.49) as compared to the control plot (1:1.01).