黑龙江省是我国东北地区春大豆主产区。自进入80年代,大豆菌核病(Sclerotinia Sol-erotiorum)日趋严重,发病率由1983年的5％左右上升到1987年的20—30％,严重地块高达50—90％,甚至绝产。1986年全省20余个市县发生此病,主要集中在齐齐哈尔、黑河两市所辖的县市,1987年40余个市县发生,几乎遍及全省各市区。以齐齐哈尔市的嫩江县为例,1983年仅在个别乡村的个别地块发病,病株率也很低。1986年该县则有13个乡镇203个村的大豆发生菌核病,面积达28.6万亩,占大豆面积的42.9％。其中发病率低于10％的占发病 Heilongjiang Province is the main producing area of ​​spring soybean in northeast China. Since entering the 1980s, sclerotinia Sol-erotiorum has become more and more serious. The incidence rate has risen from about 5% in 1983 to 20-30% in 1987, reaching 50-90% in severe land and even being absolutely dead. In 1986, the disease occurred in more than 20 cities and counties throughout the province, mainly in counties and cities under the jurisdiction of Qiqihar and Heihe cities. In 1987, over 40 cities and counties occurred, covering almost all the urban areas of the province. Take Nijiang County in Qiqihar City as an example. In 1983, it was only found in individual plots of individual villages, and the diseased plant rate was also very low. In 1986, the county had sclerotinia in soybean in 203 villages in 13 towns and villages, covering an area of ​​286,000 mu, accounting for 42.9% of the soybean area. Incidence of less than 10% of the incidence