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Components and Techniques of Economic Threshold Determinations for Programs in Integrated Pest Management (IPM). H. W. Kirby, Assistant Professor of Plant Pathology, University of Illinois, Urbana 61801. Blanche C. Haning, Associate Professor of Plant Pathology and Entomology, North Carolina State University, Raleigh 27695-7611. Plant Dis. 71:452. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0452.