大豆抗灰斑病(Cercospora sojina Hara)是三江平原大豆的主要病害。六十年代就曾大发生,给大豆生产造成很大损失。七十年代以来,由于三江平原的开发,大豆面积的不断扩大,大豆灰斑病日趋严重,现己成为一种常发性的大豆病害。致使大豆产量降低,品质变劣,商品率降低。一般中等发病,可使大豆减产12％,严重发病减产 Cercospora sojina Hara is the major soybean disease in the Sanjiang Plain. In the 1960s there was a great deal of losses to soybean production. Since the 1970s, as a result of the development of the Sanjiang Plain and the continuous expansion of the soybean area, soybean gray spot disease has become more and more serious. Now it has become a common soybean disease. Resulting in lower soybean yield, worse quality and lower commodity rate. Generally moderate disease, can reduce the yield of 12% of soybean, a serious decline in production