This book aims to document and illustrate the major developments in the use of nematodes for biological control of insects and slugs. It has three major sections covering entomopathogenic nematodes, entomophilic nematodes, and slug-parasitic nematodes. Each of these sections discusses biology, commercial production, formulation and quality control, application technology, strategy and safety. Separate chapters are devoted to the application of nematodes in different cropping systems, and the efficacy of nematodes against specific pests.