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栅锈菌种Melampsora spp.的分类过去主要根据其寄主、转主寄主范围及冬孢子形态特征;但用这个原则对杨树上栅锈菌分类是很困难的。因为:1.冬孢子的相似性,大部分杨树栅锈菌的冬孢子在形态上区别不显著;2.多寄主性;3.交叉发生性;一种杨树甚至同一棵树上能同时有两种栅锈菌存在;4.缺转主寄主性;即有些杨树栅锈菌不经转主寄主而完成生活史;5.强制接种可以使非寄主植物发病。由于分类中遇到的上述困难,使杨树栅锈菌的分类转向了夏孢子阶段的性状。Kraa-
The genus Melampsora spp. Was previously classified mainly by its host, host host and teliospore morphological characteristics; however, it is difficult to classify the genus Puccinia on poplar using this principle. Because: 1. The similarity of teliospores, most of the poplar phytoplasma winter spores in morphological differences were not significant; 2. Multiple host; 3. Cross-occurrence; a poplar and even the same tree can simultaneously There are two kinds of rust rust exist; 4. Main host lack of transfer; that is, some Poplar rust fungi without the main host to complete the life history; 5. Forced vaccination can make non-host plants. As a result of the above difficulties encountered in the classification, the classification of P. rustalis turned to the characteristics of the urosporic stage. Kraa-