多年来,用水稻抗病品种来防治稻瘟病是一种经济有效的方法,但由于稻瘟病菌生理小种的变化导致某些抗病品种抗性的丧失,使一个抗病品种的寿命只能保持3～5年或稍长一点时间。在日本如草笛、虾夷等连续栽培几年后即丧失了抗性;在国內珍汕97和窄叶青8号抗性的丧失也是这样;在省内抗稻瘟病品种中丹 Over the years, the use of resistant rice varieties to control rice blast is a cost-effective method, but due to the physiological races of M. grisea led to the loss of resistance of some resistant varieties, the life span of a resistant variety was only Maintain 3 to 5 years or a little longer time. In Japan, such as grass-like flute, shrimp and other continuous cultivation of a few years after the loss of resistance; in China Zhenshan97 and Narrow Yeqing 8 the same as the loss of resistance; in the province resistant rice blast variety Dan