近年来恶苗病已成为我区水稻的严重病害。1979年前后,曾在早金风5号等品种上严重发生,病苗率达43.4％。1981年,杂交水稻的威优系统又严重发病。据调查勉县东风公社发病面积占插秧面积的76％,较重田块病株率为20—30％。1982年全地区发病较重面积达16.2万亩,产量损失极大。是当前水稻生产中急待解决的问题。一、恶苗病的诊断及稻种带菌检验 In recent years, the disease has become a serious disease of rice in our region. Before and after 1979, once in the early gold wind on the 5th and other varieties on the serious occurrence of disease vaccine rate of 43.4%. In 1981, the prestige system of hybrid rice was severely ill. According to the survey Mianxian Dongfeng commune incidence area accounted for 76% of transplanting area, the heavier field block rate of 20-30%. In 1982 the heaviest area incidence of 162,000 mu, the output loss is enormous. It is an urgent problem in rice production. First, the diagnosis of stool disease and rice species with bacteria test