Bio pesticides are living organisms which can intervene the life cycle of insect-pests in such a way that the crop damage is minimized. The agents employed as bio pesticides, include predators, parasitoids and disease causing fungi, bacteria, nematodes and viruses, which are the natural enemies of pests. Further, they complement and supplement other methods of pest control. Utilisation of naturally occurring parasites, predators and pathogens for pest control is a classical biological control. It is the very important component of IPM (Integrated Pest Management) that helps in successful control of key insect pest under different agroecosystem. Among the bio pesticides, the products based on entomopathogenic bacteria (EPB) are most commonly used in farming community. It affects only the target pest and closely related organisms, in contrast to broad spectrum, conventional pesticides and also effective in very small quantities and often decompose quickly, resulting in lower exposures and largely avoiding the pollution problems.