Phytophthora root and stem rot (PRR), caused by Phytophthora sojae, is an economically important disease of soybean in the United States. In 2005, yield suppression by PRR in the US was estimated to cost over $250 million. Currently, the disease is primarily managed by planting varieties with genes that confer resistance (Rps genes) to the pathogen. Fourteen Rps genes have been identified, and three (Rps1c, 1k and 3a) are currently deployed in commercial varieties. The problem is P. sojae has the ability to develop new races that overcome these Rps genes. More than 70 races of P. sojae have been identified, and this number continues to increase. Thus, when a Rps gene is deployed, it...
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