大豆疫病由大豆疫霉菌Phytophthora sojae引致。20世纪50年代在美国曾大面积发生,成为当时美国大豆能否继续种植的关键因素。1991年以来,此病先在我国东北发现并且分离到了病原菌,近几年该病有逐年加重的趋势。该病引起的苗期死株率轻则10％,重则80％～90％,甚至造成局部地块绝产,对大豆生产造成严重威胁。为此,作者对P.sojae的侵染特性进行了初步研究。 Soybean blight is caused by Phytophthora sojae. 1950s in the United States has occurred on a large scale, became the United States soybean can continue to plant a key factor. Since 1991, the disease first discovered and isolated pathogens in northeast China. In recent years, the disease has been increasing year by year. The disease caused by the dead seedling rate at the light of 10%, while the weight of 80% to 90%, and even caused some of the local mass production, a serious threat to soybean production. To this end, the author conducted a preliminary study of P.sojae infection characteristics.