Additional Pythium Species Associated with the Bean Root Rot Complex in Wisconsin’s Central Sands. K. Kobriger, Research Assistant, Department of Plant Pathology, University of Wisconsin-Madison 53706. D. J. Hagedorn, Professor, Department of Plant Pathology, University of Wisconsin-Madison 53706. Plant Dis. 68:595-596. Accepted for publication 25 January 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-595.

Pythium aristosporum, P. catenulatum, P. dissotocum, and an unidentified Pythium species producing heterothallic sporangia were isolated from roots and hypocotyls of commercial snap beans growing in Wisconsin’s Central Sands. Pathogenicity tests showed that all four species caused pruning and discoloration of bean roots. This is the first known report of the association of three additional Pythium species with the bean root rot complex in Wisconsin.