Effectiveness of synthetic insecticides against Helicoverpa armigera (Hubner) Hardwick and Spodoptera litura (Fabricius) infesting groundnut.

An experiment was conducted at Anand Agricultural University, Anand during summer, 2011 to study on the evaluation of insecticides for the management of Helicoverpa armigera (Hubner) Hardwick and Spodoptera litura (Fabricius) infesting groundnut. Insecticides used in experiment were Emamectin benzoate 5 WG @ 0.002%, Thiodicarb 75 WP @ 0.075%, Indoxacarb 14.5 SC @ 0.007%, Spinosad 45 SC @ 0.018%, Novaluron 10 EC @ 0.01%, Lufeneuron 5 EC @ 0.005%, Flubendiamide 480 SC @ 0.014%, Chlorantraniliprole 20 SC @ 0.006% and Metaflumizone 22 SC @ 0.044%. Two sprays of respective insecticides were applied at 15 days interval. Among nine insecticides, chlorantraniliprole (0.006%), spinosad (0.018%) and emamectin benzoate (0.002%) were noticed higher effective and statistically at par with each other in protecting the groundnut crop from the infestation of both pests. Metaflumizone (0.044%) and lufeneuron (0.005%) were noticed poor in checking the incidence of H. armigera and S. litura. Highest cost benefit ratio 1: 3.3 was observed in chlorantraniliprole (0.006%) followed by indoxacarb treatment.