Biotechnological research has provided key developments in pest control agents, focusing on pathogens of insect pests as formulated biological pesticides. Emphasis has been placed on bacteria and viruses as they are well understood and easily manipulated. Microbial Biopesticides provides a comprehensive overview of the advances made in the use of bacteria, fungi, and viruses, while focusing on behavioral, chemical, and molecular aspects. The authors discuss the potential of nematode-based biochemical agents and bioherbicides and explore the role of microbial biopesticides in integrated pest management and their prospects for commercial exploitation.