Incremental cost-benefit ratio of certain bio-pesticides against Helicoverpa armigera Hubner (Noctuidae: Lepidoptera) in chickpea

To determine Incremental Cost-Benefit Ratio (ICBR) of certain bio-pesticides and insecticide against 2nd larval instar of Helicoverpa armigera in chickpea, an experiment was conducted during winter 2011. Certain pesticides as sole treatments were tested with standard, low and high doses and in treatment combinations with one half of standard doses of two respective pesticides only once at 50% flowering and podding stage of the crop. Upon crop maturity; total grain yield, additional yield, increased income and net income were obtained for each respective treatment to determine its ICBR. Overall, the treatment combination of 1/2 Btk + 1/2 Azadirachtin had the highest ICBR of 1: 27.57. The lowest ICBR of 1: 5.25 was obtained with Azadirachtin-0.05 %, when other treatments had ICBR from 1: 8.51 to 1: 23.28.