大豆菌病又称自腐病。近年来,随着大豆重迎茬面积的扩大,该病危害逐渐加重。一般年份发病率为3—5%,而在气温较高、雨水较多的年份发病率可达20%。大豆菌核病主要危害豆株茎秆。发病初期,茎上或分枝上的病斑为褐色,湿润状,还生有白色絮状物,病斑扩大后形成褐色枯死病斑,病株倒伏或分枝下垂,病部表面或其茎内逐渐形成黑褐色菌核,后期病斑组织破碎如乱麻状,露出木质 Soybean disease, also known as self-rot disease. In recent years, as the area of ​​soybean replanting continues to expand, the harm of the disease will gradually increase. The average annual incidence of 3-5%, while in the higher temperatures, the rain more years the incidence rate of up to 20%. Soybean sclerotinia main harm bean stalk. Early onset, lesions on the stem or branch is brown, moist, but also with white flocs, lesion expanded to form a brown withered spot, the diseased lodging or branch drooping, disease surface or stem Gradually formed within the dark brown sclerotia, later lesions such as messy tissue lesions, revealing wood