我省水稻栽培面积约500万亩左右,稻瘟病每年都有不同程度的发生,在大发生年份造成严重损失。1968年以来陆续推广的高产品种京引59、普选10号、合江20等品种,都先后表现严重感病,近年来,采用了日本的12个粳型单基因鉴别品种进行小种研究,初步明确了我省致病小种的种类、地理分布以及品种有关抗性基因对小种的反应,为我省进一步开展抗病育种和抗病品种的合理布局提供了科学依据。 Rice cultivation area of ​​about 5000000 acres in our province, rice blast each year to varying degrees, causing serious losses in the year of big occurrence. In recent years, 12 high-yielding japonica cultivars, Jingyin 59, No.10, and Hejiang20, have been successively introduced in this area. The species, geographical distribution of the pathogenic races in Zhejiang Province and the response of the resistant varieties to races were clarified, which provided a scientific basis for our province to carry out the rational layout of disease-resistant breeding and resistant varieties.