none Analysis of 6 years data on the seasonal change in the population of gram podborer and activity of its larval parasite and its relationship with the associated weather conditions, recorded at Jabalpur (M.P.) during 1973-74 to 1977-78 and in 1967-68 epidemic year, revealed that rainfall is one of the important key factors that influenced the build-up of larval population on gram crop most. Effect was additive and proportionate to the amount and its distribution in the cropping season. Rainfall in September and October 250 mm and above, highly favoured the build-up of first generation larval peak in pre-flowering stage. Winter rains in December, January and February, about 25 mm and above per month, proved highly conducive to the pest and determined the size of second major brood in the pod formation stage of crop. Minimum daily temperature of 10 to 14 degree C was optimum for the activity of pest and parasite both, while temperature below 8 degree C suppressed their activity sharply. Nutrition; Diet; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Abiotic factors; Physical factors; Land and freshwater zones; Oriental region Heliothis (Helicoverpa) armigera (Noctuidae); Food plants; Cicer arietinum (gram); Population outbreak, effect of weather; Hymenopteran parasites; Ecphoropsis (Campoletis) predistinctus; Irruption; Seasonal abundance; Weather conditions, on gram; Climate and weather; Population outbreak on gram, relationship; India; Madhya Pradesh; Jabalpur; Population dynamics, effect of weather conditions Ecphoropsis (Campoletis) perdistinctus (Ichneumonidae); Lepidopteran hosts; Helicoverpa armigera; India; Madhya Pradesh; Jabalpur