This University of Wisconsin-Madison Division of Extension publication provides an introduction to the biological control of pest insects and mites. It includes basic biological information on insects and how they become pests. A major part of the publication is dedicated to a survey of natural enemies. As there are hundreds of natural enemy pests in the North Central United States, the book provides examples from the more common groups of insect predators, parasitic insects, insect-parasitic nematodes and insect pathogens. The publication also looks at finding new natural enemies, enhancing the effectiveness of existing enemies, and releasing natural enemies when not enough are naturally present.

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