'This book provides an account of the basic concepts of biopesticides for undergraduate and post graduate students of entomology of all agricultural universities and research institutions as well as to the research scholars engaged in the study of biopesticide application in various crops. It is also useful to the researchers who are working on toxicology, because we are now stepping towards sustainable development and reducing the use of chemical pesticides which was dominating our agricultural production from Green revolution. Now there should be needful step to be taken to promote the use of biopesticides. This book deals with all aspects of biopesticides, starting from historical background to on farm production of biopesticides. Thus, this book deals with almost all major aspects of biopesticide. It is hope this book will be useful not only to the students, but also to researchers and scientists.'