Pathogen pathogenicity and host resistance are internal factors in deciding plant diseases. Wheat leaf rust is a kind of worldwide disease.
在病害三角关系中，病原物的致病性及寄主的抗病性是决定病害发生与否的内在因素。
Wheat leaf rust caused by Puccinia triticina is one of the most important diseases and can cause significant yield and economic losses.
利用抗病品种是防治小麦叶锈病最经济、有效的方法，小麦叶锈菌群体毒性的改变是导致小麦抗叶锈品种丧失抗性的主要原因。
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