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病灶:多发生在菜豆生长中后期,主要侵害叶片,病情严重时茎、蔓,叶柄及荚均可受害。锈病发生初期,叶片出现褪绿或淡黄色小斑点,直径约0.5～2.5毫米,稍后中央突起,渐扩大显出深黄褐色孢子堆,表皮破裂后,散发出褐色粉末,即夏孢子;后在夏孢子堆上或四周生成紫黑色疱斑,即冬孢子堆。有时叶面或背面可见略凸起的白色疱斑,即病菌锈子腔。寄主衰老后,叶片枯死。荚染病形成突出表皮疱斑,表皮破裂后散出褐色孢子粉,即冬孢子堆和冬孢子,发病严重的将无法食用。
Foci: Occurred in the late growth of beans, the main violations of the leaves, the serious condition of stems, vine, petiole and pods can be harmed. At the initial stage of rust occurrence, the leaves appear chlorotic or light yellow spots with a diameter of about 0.5-2.5 mm. Later on, the center protrudes and gradually expands into dark brown spore heaps. After the epidermis ruptures, it emits brown powder, ie, summer spores; In the summer spore reactor or around the formation of purple black blister spot, namely winter spore pile. Sometimes the surface of the foliage or back slightly visible white blister spot, that is, bacteria rust cavities. When the host is old, the leaves are dead. Prominent epidermal blister podosis disease blistering, epidermal rupture of brown spore powder, that winter teliospores and teliospores, the incidence will be unable to eat.