Field Studies on Efficacy of Novel Insecticides Against Helicoverpa Armigera (Hubner) in Chickpea

Abstract

For present investigation entitled "Field studies on efficacy of novel insecticides against Helicoverpa armigera (Hubner) in chickpea", the field experiments was conducted in rando.mized block design with three replications of seven treatments during Rabi season 201 0-11 at entomological research block of crop research centre, Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U.P.) 250110. The seasonal incidence of H. armigera was recorded weekly and the larval peaked found population in all control plots on 15th April (15th standard weeks) and when the maximum and minimum temperature 34.00 oc and 17.67 oc respectively, relative humidity 57.5 7% and rainfall 0.00 mm were recorded. However, minimum population of 1.21 larvae was recorded in the 1st standard week when the maximum and minimum temperature 13.35 oc and 4 oc respectively, relative humidity 77.78 percent and rainfall 0.00 mm were recorded. The correlation of the larval population of H. armigera was found positive with maximum, minimum temperature and rainfall. It was negatively correlated with relative humidity. Efficacy of different treatments viz., indoxacarb 14.5 SC@ 500 mVha, cypermethrin 25 EC @1000 mVha, lambda cyhalothrin 5 EC@ 500 mVha, thiodicarb 75 WP@ 625 gm/ha, spinosad 45 SC@ 200 mUha and carbosulfan 25 EC 1000 mVha tested against H. armigera larvae revealed that indoxacarb 14.5 SC @ 500 mVha was found best with minimum population of H. annigera at first spray 1.33 larvae (3 DAS) and 2.00 larvae (9 DAS), and the minimum larval population at second spray 1.67 (3 DAS) and 3.33 larvae (9 DAS), minimum percent pod infestation at first spray 0.89 (3 DAS) and 1.91 (9 DAS), and minimum percent pod infestation at second spray 1.02 (3 DAS) and 3.65 (9 DAS). The treatment with indoxacarb 14.5 SC was also found best with the highest grain yield (22.85 q/ha), maximum increase in yield (13.59 q/ha) over control, maximum net return (Rs. 36990.00/ha) and highest cost benefit ratio (1: 9.78) followed by thiodicarb 75 WP @ 625 gm/ha. The cypennethrin 25 EC @1 000 ml/ha was recorded less effective among all the treatments.