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。
Before 1949, 13 wheat varieties were released but they are susceptble to stem rust, so wheat production here strained by the disease.
建国前虽推广13个抗旱丰产类型品种，但均不抗秆锈病，致使秆锈病严重，威胁小麦生产。
Before 1949, 13 wheat varieties were released but they are susceptble to stem rust, so wheat production here strained by the disease.
建国前虽推广13个抗旱丰产类型品种，但均不抗秆锈病，致使秆锈病严重，威胁小麦生产。
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