小麦条锈病的流行程度取决于寄主的感病性、菌源数量、气候条件三大因素[1]。寄主的感病性是小麦条锈病发生流行最为重要的因素,但在生产实际中,寄主的感病性的变化幅度较小,比如甘肃小麦感病品种种植面积多年来一直保持在85%左右,是一个极为有利的状态,理论上全省小麦条锈病年年都应该大流行,但事实并非如此。多年来, The prevalence of wheat stripe rust depends on the host’s susceptibility, the number of bacteria, climatic conditions three factors [1]. Host susceptibility is the most important factor in the occurrence of wheat stripe rust epidemic. However, in the actual production, host susceptibility changes less, for example, the cultivated area of ​​wheat susceptible cultivars in Gansu Province has been around 85% for many years, It is an extremely favorable state. Theoretically, wheat stripe rust in the entire province should be pandemic every year, but this is not the case. Over the years,