Vol. 17 No. 3
Efficacy of some novel insecticides against gram pod borer (Helicoverpa armigera Hubn.) infesting chickpea
Abstract: The present experiment was carried out in a farmer’s field in Nadia district of West Bengal to find out the relative effectiveness of four novel insecticides viz. Alpha cypermethrin 10% EC @ 25.0 g a.i. ha-1, Teflubenzuron 150 SC @ 15.0 g a.i. ha-1, Lambda cyhalothrin 5% EC @ 25.0 g a.i. ha-1and Spinosad 45 SC @ 75.0 g a.i. ha-1 for managing gram pod borer population infesting chickpea crop during two consecutive rabi seasons of 2019-20 and 2020-21. From the results it was observed that all the treatments were superior over untreated control in managing the pest. Among the insecticides tested, Spinosad 45 SC was proved to be the most effective insecticide providing maximum reduction over untreated control during both the years (97.89%and 98.57% during 2019-20 and 2020-21, respectively) followed byLambda cyhalothrin (72.26% and 71.93%), Alpha cypermethrin (65.52% and 63.18%) and Teflubenzuron (59.76% and 55.47%). Maximum seed yield (14.83 q ha-1 and 14.01 q ha-1during 2019-20 and 2020-21, respectively) was also obtained from Spinosad treated plots followed by Lambda cyhalothrin (12.74 q ha-1and 11.98 q ha-1), Alpha cypermethrin (11.52 q ha-1and 10.72 q ha-1) and Teflubenzuron(10.46 q ha-1and 9.92 q ha-1). However, the lowest yield was recorded from control plot.
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