用药不同的两种黄瓜病害黄瓜霜霉病与黄瓜角斑病都是黄瓜重要的病害。黄瓜霜霉病：叶面上多角形病斑颜色较深（黄褐色），叶背有灰黑色霉层，不穿孔，病叶对光透视无透光感，不危害瓜条。黄瓜角斑病：叶面上病斑颜色较浅（灰白色），叶背有白色菌脓，病叶对光透视有透光感... Cucumber disease cucumber downy mildew and cucumber angular leaf disease are important cucumber diseases. Cucumber downy mildew: polygamous lesion on the foliage darker (yellowish brown), gray-black mildew on the back of the leaves, non-perforated, diseased leaves no sense of light transmission of light fluoroscopy, do not jeopardize the melon. Cucumber angular leaf spot: the lesion color on the foliage is lighter (grayish white), the leaves have a white pus in the back, the diseased leaves have light-transmitting sensation on the light ...