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Symposium: Estimating Yield Reduction of Major Food Crops of the World

Introduction. S. P. Pennypacker, Department of Plant Pathology, Pennsylvania State University, University Park 16802; Phytopathology 73:1575. Accepted for publication 24 May 1983. Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-1575.