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Four New Physiologic Races of Phytophthora megasperma f. sp. glycinea. B. L. Keeling, Research Plant Pathologist, U.S. Department of Agriculture, Agricultural Research Service, Southern Region, Stoneville, MS 38776. Plant Dis. 66:334-335. Accepted for publication 8 December 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/PD-66-334.

Hypocotyls of differential soybean (Glycine max) cultivars were inoculated to identify four new physiologic races of Phytophthora megasperma f. sp. glycinea (syn. P. megasperma var. sojae) that differ from races 116. These new physiologic races are proposed as races 1720.

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