应用抗病品种是防治植物病害经济而卓有成效的措施。但由于自然界中病原菌生理类型不断发生变异,许多作物品种抗病性丧失现象不断出现。如我国小麦条锈病,多年来生产实践证明,一个抗锈良种,一般在生产上种植5—10年以后即丧失其抗锈性。国外在马铃薯抗晚疫病品 The application of disease-resistant varieties is a cost-effective and effective measure for controlling plant diseases. However, due to the continuous variation of the physiological types of pathogens in nature, the loss of disease resistance of many crop varieties is constantly emerging. Such as wheat stripe rust in our country over the years production practice has proved that a rust-resistant elite, generally planted in the production of 5-10 years after the loss of its rust resistance. Anti-late blight products in potato in foreign countries