菜豆锈病主要发生在叶片上,严重时亦危害叶柄和种荚。发病初期,对背产生淡黄色的小斑点,后变锈褐色,隆起呈小脓疱病斑。扩展后成为红褐色夏孢子堆,表皮破裂散出红褐色粉末。这时从叶正面观察则形成褪绿斑点。到后期孢子堆即变成黑色的冬孢子堆。有时叶正面也产生夏孢子堆或冬孢子堆,导致叶片变形早落。种荚染病也产生很多夏孢子堆或冬孢子堆,食用价值严重降低,甚至不能食用。 Bean rust occurs mainly in the leaves, in severe cases also harm the petiole and seed pods. Early onset, pale yellow on the back of a small spot, after the change rust brown, swelling was a small pustular lesion. Expanded into a reddish brown summer spore reactor, rupture of the skin scattered red brown powder. At this time from the front of the leaves are observed formation of chlorotic spots. To the late spore pile into a black winter spore pile. Sometimes the front of the leaves also produce summer spores or teliospores, leading to leaf deformation early fall. Species of pods also produce a lot of summer spores or winter spores, food value is seriously reduced, or even can not eat.