Resistance of Medicago Species Accessions to Phytophthora megasperma f. sp. medicaginis. J. A. G. Irwin, Research Assistant, Department of Plant Pathology, University of Wisconsin, Madison 53706. D. P. Maxwell, Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 64:396-397. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-396.

Resistance to six isolates of Phytophthora megasperma f. sp. medicaginis was evaluated in 25 accessions, all closely related to Medicago sativa. M. coerulea (PI 299046) and M. falcata (PI 377727) were most resistant, with 26 and 21% resistant plants, respectively. Many accessions contained relatively few resistant plants.