The aim of this handbook is to provide an identification guide for use by scientists and growers dealing with major arable crops, such as cereals, sugar beet, oil-seed rape, maize/corn and potatoes. All key groups of commercially-bred predators and parasites are included - insects, arachnids, relevant nematodes and pathogens. Photographs and accompanying drawings enable the reader to identify each species and its effects. The text for each species includes a detailed desciption, life cycle, life history, habits, associations to specific crops and pests and potential influence on farming practice. The handbook also contains an index of common names, scientific names, key species and rarer species, plus main literature references for each grouping.