豌豆白粉病主要为害豌豆叶片、茎蔓和种荚。叶片发病初期,在叶面上有白粉状淡黄色小斑,后扩为不规则形状的病斑,并相互连合成片,病部表面被白粉覆盖,叶背则呈褐色或紫色斑块。严重时叶片迅速枯黄。茎蔓和种类发病,亦产生白粉斑,严重时白粉 Pea powdery mildew mainly infects pea leaves, stalks and seed pods. In the early stages of leaf development, white powdery light yellow spots appeared on the foliage, which expanded into irregularly shaped spots and joined together into pieces. The surface of the diseased part was covered with white powder while the back of the leaves showed brown or purple patches. Serious yellow leaves rapidly. Vines and species of disease, but also produce white spots, severe white powder