Entomopathogenic nematodes (EPNs) are biocontrol agents that are used to control a wide variety of insect pests within agriculture and forestry. In addition to their use as bio-pesticides, EPNs have a fascinating biology and are thus considered model organisms in ecology, symbiosis and pathogenesis. This book presents basic knowledge and diverse applications to illustrate how EPNs play an important role as potent biocontrol solutions. It describes: Fundamental concepts such as biology, taxonomy, symbiosis genomics and behavioural ecology. Aspects of commercialization, including mass production, formulation, safety and regulation, and marketing. Diverse cropping systems e.g. maize, wheat and grains, citrus, orchard systems, berries, vine crops, vegetables and turf. Other applications including urban, nursery, forestry, greenhouse, veterinary and medical. Ecological considerations and applications in conservation biocontrol. This book is a must have for all pest management professionals including those practicing integrated pest management strategies.