1.田间症状 黄瓜在整个生长期均能感染疫病。苗期感病,嫩尖部位初呈暗绿色水浸状,病部缢缩,其上叶逐渐枯萎,最后全株枯死。叶片感病,初呈水浸状小斑点,后扩大成不规则形的大病斑,边缘不明显,中心呈青白色,天气干燥时病斑易破裂,潮湿时全叶腐烂。果实感病多从花蒂部位开始,病斑呈深绿色水浸状,近圆形凹陷,很快扩展到整个果实,病果皱缩软腐,表面 1. Field Symptoms Cucumber can infect the disease throughout the growing season. Seedling disease, tender tip of the early dark green-like flooding-like disease shrinking, the upper leaves gradually wilt, and finally died of whole plant. Leaves susceptible to the initial was flooded small spots, enlarged into irregular large lesions, the edge is not obvious, the center was blue and white, the weather is dry, easy to rupture of the lesion, the rotten leaves when wet. Fruit flu more from the beginning of the pedicle position, the lesion was deep green water-immersed, nearly circular depression, and soon spread to the entire fruit, fruit shrinkage soft rot, the surface