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Before one can apply Integrated Pest Management in the greenhouse with biological controls (Part I), one must be able to distinguish the beneficial from the dastardly. Gill (U. of Maryland Cooperative Extension Service) and Sanderson (entomology, Cornell U.) explain how to collect pest and plant damage samples and submit them to a professional diagnostic lab. Some 450 mercifully small color photographs help in the identification of major pests from aphids to weevils (Part 2), and identification of damage in specific crops (Part 3). Annotation c. by Book News, Inc., Portland, Or.