This book provides substantial information regarding insecticides and their applications in the field of pest engineering. The first section on insecticides mode of action focuses on toxicity of organic and inorganic insecticides, organophosphorus insecticides, toxicity of fenitrothion and permethrin, and dichlorodiphenyltrichloroethane (DDT). The second section is dedicated to vector control using insecticides, biological control of mosquito larvae by Bacillus thuringiensis, metabolism of pyrethroids by mosquito cytochrome P40 susceptibility status of Aedes aegypti, etc. The book will attract readers to make rational decisions regarding the usage of pesticides.