自20世纪80年代以来,大豆根腐病和大豆抱囊线虫病等仍然普遍发生,危害严重,是目前的主要防治对象。有些已经得到有效控制的病害,现在又有所回升。如大豆灰斑病在20世纪后期基本得到控制,灰斑粒控制在3%以下,近几年又有大面积发生。而以往在田间发病较轻的次要病害在近年发生程度逐渐加重而上升为主要病害,如:大豆褐 Since the 1980s, soybean root rot disease and soybean cyst nematode disease are still common and serious harm, is the main target of prevention and treatment. Some diseases that have been effectively controlled have now picked up again. Such as soybean gray spot disease was basically controlled in the late 20th century, gray speckle control in 3%, in recent years have a large area. In the past, minor diseases with less serious disease in the past gradually increased in recent years and rose to major diseases such as soybean brown