1986年我们在广东省白叶枯病常发地区茂名市所属的化州、电白、信宜和茂南等县(区)大面积推广种植抗白叶枯病和稻瘟病品种植20-5共3500亩,1年后,在信宜县种植的植20-5品种上发现了严重感染白叶枯病的病叶,经采集分离测定,证实该菌株对高抗的鉴别品种IR26表现感病,是一个新的强毒菌系。 In 1986, we popularized the cultivation of bacterial blight resistance and rice blast cultivars 20-5 in Huazhou, Dianbai, Xinyi and Maonan counties (districts), which belong to Maoming City, where the bacterial blight in Guangdong Province is frequent. A total of 3500 acres, one year later, the planting of 20-5 varieties planted in Xinyi County of the diseased leaves of serious bacterial blight found by the collection and determination, confirmed that the strains of high resistance to the identification of susceptible varieties IR26 , Is a new virulent strain.