Phytophthorasojae causes a root rot that is a major constraint in soybean production in many regions of the United States and throughout the world. This disease is best managed with resistant varieties. One or two types of resistance may be found in commercial varieties, specific (Rps genes) and partial resistance. Some root rot develops at a much slower rate in varieties with partial resistance. In many fields in the north central region of the United States, populations of P.sojae exist that can infect varieties with the currently deployed Rps genes. New Rps genes as well as additional sources of partial resistance are needed. This study evaluated more than 800 soybean accessions for specific resistance and partial resistance to P.sojae. A complete listing of the reactions is included, and the data is searchable on the USDA National Plant Germplasm System, Germplasm Resources Information Network (GRIN).
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