To study the population dynamics of gram pod borer (Helicoverpa armigera Hubner) in chickpea and to evaluate the benefit-cost ratio of different intercrop patterns

The present investigation entitled “To study the population dynamics of gram pod borer (Helicoverpa armigera Hubner) in chickpea and to evaluate the benefit-cost ratio of different intercrop patterns”. An experiment with randomized complete block design including three replications and nine treatments was carried out in investigation field of SHUATS, Allahabad to compare various combinations of chickpea intercropping. Among all the intercrops chickpea equivalent yield revealed that, the highest yield was recorded in chlorpyriphos treated treatment of 19.48 q ha-1, Followed by Chickpea + Marigold, Chickpea + Wheat, Chickpea + Coriander and Chickpea + Mustard with 19.13, 16.55, 16.43 and 15.52 q ha-1 respectively. Chickpea sole was recorded with 14.28 q ha-1. The highest cost benefit ratio was recorded in chlorpyriphos, Followed by Chickpea intercropped with Coriander, Marigold, Mustard and Lentil. Seasonal incidence study revealed that, incidence of gram pod borer larvae (0.84) was observed during 06thstandard week i.e., in first week of February. Later number of larvae was increased gradually and reached peak (3.94) during 10th standard weeks i.e., in first week of March but in 11thstandard week declined trend was observed.