In this book B. cereus was used as a mosquito larvicidal agent against the major vector mosquitoes such as Cx. quinquefasciatus, An. Stephensi and Ae. aegypti and recorded significant mosquito larval controlling efficiency. The present investigation also detailed the anatomical dislocation or disintegration of the cells of the gut regions of An. Stephensi. Their rapid potential in assassination often providing B. cereus, an eligibility to become the potential larvicidal, eco-friendly agent in the mosquito born disease control programme.