author(s)
Veer Vikram Singh, Neerja Agarwal, Sathish BN, Sanjeev Kumar, Sachin Kumar and Krishan Pal

abstract
A study on the insect diversity in chickpea and mustard ecosystem was carried out in the field at Student Instructional Farm, C.S.A.U.A&T, Kanpur during winter of 2015-2016. Altogether four insect-pests Helicoverpa armigera (Hubner), Agrotis ipsilon (Hufnagel), Spodoptera litura (Fabricius) and Odontotermes obesus (Rambur)} and two natural enemies of chickpea pod borer Trichogramma chilonis (Ishii) and Campoletis chlorideae (Uchida) have been recorded in the chickpea. Among these pests of chickpea, gram pod borer were found as key pest in the field, respectively. It was appeared first in the 51^st SW (Standard week) during mid-December with its initial intensity of 0.25 larvae m^-1 row which increased in subsequent weeks up to 8^th SW and touched the peak population of 13.00 larvae m^-1 row during 9^th SW. It showed positive correlation with respect to maximum temperature while negative correlation with minimum temperature, relative humidity and rainfall. Larval parasitization of H. armigera by the parasitoid, C. chlorideae was observed predominantly in chickpea ecosystem as compared to egg parasitoid, T. chilonis. Host population and weather factors played significantly positive role in the parasitization. It was observed that 7^th SW with maximum temperature of 30.4 °C, minimum temperature of 11.7 °C and RH of 75.0 per cent was observed as was the most conducive period for the larval parasitization. As regards the biotic factors of gram pod borer, H. armigera exhibited a significant positive correlation with T. chilonis, which indicate an important role in suppressing the pest population to some extent.