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Three New Physiologic Races of Phytophthora megasperma var. sojae. F. A. Laviolette, Associate Professor, Purdue University, West Lafayette, IN 47907; K. L. Athow, Professor of Plant Pathology, Purdue University, West Lafayette, IN 47907. Phytopathology 67:267-268. Accepted for publication 20 September 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-267.

Physiologic races 7, 8, and 9 of Phytophthora megasperma var. sojae from soybean are reported from their reaction on a new, uniform set of soybean differentials consisting of Harosoy, Sanga, Harosoy 63, Mack, Altona, P.I. 103.091, and P.I. 171.442.

Additional keywords: Phytophthora root rot, soybean disease.