Evaluation of the efficacy of insecticides and bio-pesticides against Helicoverpa armigera (Hubner) on tomato

Abstract

Field studies were carried out for the control of Tomato fruit borer (Helicoverpa armigera) during in Rabi season 2018-19 at Student Instructional Farm-“Insectary”, Department of Entomology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur. The present investigation to evaluate the efficacy of some insecticides and biopesticides on tomato Azad Type-6 variety was taken and treated against Tomato fruit borer. The climate of Kanpur Nagar is sub-tropical with hot dry summer and severe cool in winter season, we applied chemical insecticide viz. Indoxacarb 14.5SC, Fipronil 5SC, Malathion 50EC, Imidacloprid 17.8SL and bio-pesticide viz. Spinosad 45SC & Neemarin 1500PPM at their recommended doses. The data on larval counts were taken from 10 randomly selected plants of each plot treated with pesticides, separately. It was observed that Indoxacarb 14.5SC @ 1.0 ml lit-1 was found to be very effective against Helicoverpa armigera followed by Fipronil 5SC @ 1.0 ml lit-1 in reducing the larval population and showed highest percent reduction in fruit infestation to 85.04% and 81.78% over control. Among the bio-pesticides, spinosad 45SC @ 0.20 ml/lit found to be effective as it showed 72.51% fruit infestation reduction over untreated plot. All the above treatments were found to be superior over untreated control which recorded highest number of larvae and fruit damage per plant.