Synthetic insecticides have been effectively used during past several decades to control variety of insects and crop pests. The use of chemical insecticides has been greatly impeded due to development of physiological resistance in the vectors, environmental pollution and harmful effects on beneficial non-target animals. Therefore, the need of alternate, more effective and environment-friendly control agents became imperative.In this study,out of twenty two B.t isolates from the soil, six were found significantly toxic to 3rd instar larvae of Anopheles stephensi. One isolate SBS B.t 45, which...