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Letter to the Editor Estimating Parasitic Fitness. D. R. MacKenzie, Assistant Professor, Department of Plant Pathology, Buckhout Laboratory, The Pennsylvania State University, University Park, PA 16802; Phytopathology 68:9. Accepted for publication 24 October 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-9.