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Letter to the Editor

Monocyclic and Polycyclic Root Diseases: Distinguishing Between the Nature of the Disease Cycle and the Shape of the Disease Progress Curve. W. F. Pfender, Research associate, Department of Plant Pathology, 1630 Linden Drive, University of Wisconsin-Madison, Madison 53706; Phytopathology 72:31. Accepted for publication 29 July 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-31.