Phytophthora root rot of soybean (Glycine max(L.) Merr.), caused by Phytophthora sojae, is a major disease of soybean worldwide, and occurs at local region in China. P. sojae was A1 import quarantine fungus and quarantine fungus in China. The highest economic losses arise as a result of both direct plant loss and the costs of replanting when favorable environmental conditions occur just after planting. P. sojae has been managed successfully over the years with single gene resistance (Rps genes). But sometim...