none Investigations were carried out on population of spotted bollworm, Earias vittella (Fab.) during different overlapping generations in pesticides free cotton field. Rogas aligharensis (Quadri.) was one of the important mortality parameters in the larval stage of spotted bollworm. The parasitisation by Microchelonus sp. and Bracon sp. was 7.55 and 5.10 per cent in first generation of pest. The pest passed through four overlapping generations in pesticide free cotton field.