利用抗病品种防治小麦锈病是国内外公认的最简单、经济和有效的方法。也一致认为是防治的主要甚至是唯一的手段。但病菌是易变的,抗病品种失去抗病的事例已屡见不鲜。抗病品种丧失抗性后,不得不压缩感病的,扩大抗病的品种面积,即被动地完成一次品种更新过程。某一品种的推广面积愈大,带来的困难也愈多,需要的时间也愈长。而一个好的抗病品种又往往不推自广,以致出现单一化的局面。五十年代的碧蚂1 The use of resistant varieties to control wheat rust is recognized at home and abroad the most simple, economical and effective method. They also agreed that they are the main and even the only means of prevention and control. However, the germs are mutable, and it is not unusual for the resistant varieties to lose their disease resistance. After the resistant varieties lose their resistance, they have to compress the susceptible and expand the area of ​​resistant varieties, that is, passively finish the process of breed renewal. The larger the promotion area of ​​a certain variety, the more difficulties it brings and the longer it takes. A good disease-resistant variety is often not promoted by itself, resulting in a single situation. Bi Mao fifties 1