Vol. 11, Issue 3 (2022)

Author(s):
Lavanya V and Ashwani Kumar

Abstract:
A field experiment was conducted during Rabi season of 2015-2016 at the central research farm of Sam Higginbottom Institute of Agriculture, Technology and Sciences, Deemed-to-be-University, Allahabad to evaluate the efficacy of certain chemicals against Gram pod borer, Helicoverpa armigera (Hubner) on chickpea (Cicer arietinum L.) The occurrence of pod borer commenced from 6^th standard week (February first week) with an average population of 0.42 larvae/plant. The pod borer population increased and gradually reached its peak level of 6.48 larvae/plant at 12^th standard week (March last week) there after declined trend was observed as temperature increased. It was observed that the temperature between 30-37⁰C favored the multiplication of gram pod borer. The per cent population reduction of gram pod borer H. armigera on third, seventh and fourteenth days after spraying revealed that all treatments are superior over control. Among the treatments rynaxypyr found superior over all the treatments followed by spinosad and indoxacarb after first and second sprays, respectively. Highest reduction in larval population (74.02%) was observed with rynaxypyr 20 SC @ 0.3 ml/lit. Minimum pod damage of 11.98% and highest yield of 2390 Kg/ha was registered in rynaxypyr. Highest cost benefit ratio (C:B) was recorded in indoxacarb (1:3.07) followed by spinosad (1:3.01), rynaxypyr (1:2.92), flubendamide (1:1.96), cypermethrin (1:2.85), lambda cyhalothrin(1:2.68) and chlorpyriphos (1:2.67).