Indiscriminate use of pesticides in today's intensive agriculture has made the crop ecosystem free of natural enemies, in turn affecting the tritrophic interaction (host, pest and parasitoid). Natural enemies Hence development of resistant natural enemies is the need of the hour to make IPM a success, which aims at maintaining the pest population at a level without causing any ill effects on the environment. In India efforts were being carried out to develop insecticide resistant strains of bioagents such as Trichogramma, a most commonly used efficient egg parasitoid.