Field efficacy of some insecticides and Bt against Helicoverpa armigera on chickpea

RUCHIRA TIWARI and V.K. SEHGAL

Department of Entomology,

College of Agriculture,

G. B. Pant University of Agriculture and Technology,

 Pantnagar-263 145 (U.S. Nagar, Uttarakhand)

ABSTRACT

The field efficacy of insecticides (endosulfan, monocrotophos, cypermethrin, deltamethrin and fenvalerate) individually and in combination with Bacillus thuringiensis var kurstaki (Bt) Berliner was evaluated on Helicoverpa armigera (Hubner) in chickpea under field conditions during 1998-99 and 1999-2000 rabi crop seasons. The chickpea crop was sprayed twice in both the years with the respective insecticides when pest population exceeded the economic threshold level. Among the tested chemicals, cypermethrin + Bt var kurstaki, cypermethrin, deltamethrin + Bt var kurstaki and Bt var kurstaki were found significantly superior over rest of the treatments and two years data clearly showed that insecticides in combination with Bt var kurstaki were found highly effective in increase in grain yield and in reducing larval population and pod borer damage.