紫云英是长江流域稻区的主要绿肥作物,往往由于菌核病的为害,鲜草产量极低。尤其是冬前发病,成团死苗,形成病窝,既影响冬前长势,又为次年春天发病繁殖了病源。因此,抓好此病的冬前防治,既是保证苗齐、苗壮的重要措施,又是获得鲜草高产的先决条件。为了预防和减轻冬前发病,可采用下列方法: Aspen is the main green manure crop in the Yangtze River area of ​​rice, often due to scab disease damage, fresh grass yield is very low. In particular, the incidence of pre-winter, Cheng Miao dead seedlings, nest formation, not only affect the growth of winter, but also the incidence of the next spring breeding pathogen. Therefore, a good grasp of the disease prevention and treatment before the winter is not only an important measure to ensure seedling strength and seedling strength, but also a prerequisite for obtaining fresh grass yield. In order to prevent and reduce the incidence of pre-winter, the following methods can be used: