This book covers the efficacy of Beauveria bassiana, a enotomopathogenic fungi against Odontototermes obesus, Helicoverpa armigera and Spilosoma obliqua and describes about methodology of isolation of entomopathogenic fungi and explains about life cycle of different insect pests with their duration of stages. It is clearly indicated about optimum concentration of entomopathogenic fungi against different insects. Finally it gives an idea about efficacy of beauveria bassiana in invitro against Odontototermes obesus, Helicoverpa armigera and Spilosoma obliqua to the researchers who wants to work on this topic in future.