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由叶锈病菌(Puccinia recondita Rob.ex.Desm.f.sp.tritici)引起的叶锈病是世界范围内最主要的病害之一.在美国的密西西比河流域上游,该病菌对感病品种具有一种潜在性的威胁.叶锈病之所以成为一种潜在威胁还在于它的致病性具有广泛的变异力.这种变异力可遗传而且可寄生在以前能抗病的品种上.这种情况连同原有的锈病自然群体中产生的新病原曾经引起了叶锈病大流行,造成了普遍损失.
Leaf rust caused by Puccinia recondita Rob.ex.Desm.f. sp. Tritici is one of the most important diseases in the world .In the upper reaches of the Mississippi River in the United States, the pathogen has one Potential Threats Leaf-leaf rust is also a potential threat because of its wide variation of pathogenicity, which is heritable and parasitic on previously resistant varieties, The new pathogens that originated in natural populations of the original rust had caused a leaf-leaf rust pandemic that caused widespread losses.