A field experiment was conducted at experimental field of Deptt. of Entomology, Live-stock Farm, Adhartal, J.N. Krishi Vishwa Vidyalaya, Jabalpur (M.P.) during kharif season 2009-2010.It was observed that pod borer, Helicoverpa armigera (Hub.), start infesting the crop during the reproductive stage i.e. 44th SW and 45th SW (0.01 eggs/plant and 0.35 larvae/plant) and population of the pests egg and larva available up to maturity stage i.e. 01stSW (1.8 eggs/plant and 0.15 larvae/plant). Two natural enemies, predatory lady bird beetle, Cheilomenes sexmaculatus Fab. were active in vegetative i.e. 38th SW (0.56 beetles/plant) to 44thSW (0.08 beetles/plant) and larval parasitoid of Lepidoptera Cotesia (= Apanteles) sp wasp pupae during late reproductive i.e. 50th SW (2 pupae/25pods) to 52nd SW (3 pupae/25pods) growth phase of the crop respectively. Crop habitat manipulation considerably alters the pod borer and its natural enemies, population built up also concomitant pod and grain damage entail by pod borer in pigeonpea. Pigeonpea bordered by maize (PP+M) followed by the sorghum as border crop around the pigeonpea (PP+S) were the promising habitats than pigeonpea sole (PP).
Correlation studies shown that pod borer oviposition favored positively by morning relative humidity while maximum and minimum temperature and morning vapour pressure impact it negatively. Further none of the weather parameter found exerting statistically significant positive or negative correlation on pod borer larval and parasitoid Cotesia wasp pupal population. Among the various abiotic factors studied minimum temperature, rainfall, evening relative humidity, wind speed, morning and evening vapour pressure, and rainy days exerts significant positive whereas sunshine significant negative impact on incidence of lady bird beetles in pigeonpea.