Effect of different chemicals for management of Helicoverpa armigera (Hubner) in pigeonpea

Field experiments were carried out at ten locations of Manjhi block of Saran District (Bihar) during 2011 and 2012 on pigeonpea crop cv NDA-1 to find out the efficacy of different chemicals against pod borer, Helicoverpa armigera (Hubner). The investigation revealed that technology option first comprised of spraying of spinosad 45.1 SC @ 0.33 mlilitre water followed by technology 2^nd spraying of imidacloprid 14.8 SC @ 0.33 mlilitre water at ten locations were most effective against pod borer. The maximum grain yield was observed in technology first 16.2 and 18.4 q/ha, respectively which was significantly superior over all the treatments. The studies conducted on impact of various technology options showed that net return was also higher in technology first (Rs. 56608 and Rs. 56660) during both years.