Studies on Seasonal incidence and efficacy of Novel Insecticides and bio pesticides against gram pod borer Helicoverpa Armigera (Hubner) in Chickpea

Abstract

The field experiment was conducted during Rabi 2011-2012 at Crop Research Centre (Chirori farm) of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut-250110 (U.P.) for the "Study on seasonal incidence and efficacy of novel insecticide and bio pesticide against gram pod borer Helicoverpa armigera (Hubner) in chickpea" in a randomized block design with three replications, consisting eight treatments. In the experiment adult population start increasing 12th to 18th December (50th standard weeks) and maximum adult population of H. armigera were recorded during crop season from 2"d to ath April (14th standard weeks) in pheromone traps. Seasonal incidence of H. armigera was recorded during 2011-12. Larval population was found throughout the crop season and highest larval populations were in 15 standard weeks (9th to 15th April) in the control plot. The incidence of this pest was positively correlated with temperature, rainfall and negatively with relative humidity. Efficacy of different treatments (indoxacarb 14.5 SC @ 500 mllha, spinosad 45 SC @ 200 ml/ha, lambda cyhalothrin 25 EC @ 500 ml/ha. quinalphos 25 EC@ 1000 ml/ha, fenvalerate 10 EC@ 1000 ml/ha, neemarin 1500 ppm @ 3000 mllha and HaNPV 500 LE/ha) tested against H. armigera larvae found that indoxacarb 14.5 SC @ 500 ml/ha was found best with minimum population of H. armigera at first spray 1.00 larvae (3 DAS), 1.67 larvae (7 DAS) and 2.33 larvae (10 DAS), and the minimum larval population at second spray 1.33 (3 DAS), 2.00 larvae (7 DAS) and 3.67 larvae (10 DAS), minimum pod damage percent at first spray 0. 79 (3 DAS), 1.82 (7 DAS) and 2.54(1 0 DAS), and minimum pod damage percent at second spray 1.25 (3 DAS), 2.60 (7 DAS) and 3.65 (10 DAS). The treatment with indoxacarb 14.5 SC was also found best with the highest grain yield (22.04 q/ha), maximum increase in yield (12.47 q/ha) over control, maximum net return (Rs. 38781.7.00 q/ha) and highest cost benefit ratio (1 : 9.87).