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韭菜疫病是韭菜生产重要病害。由鞭毛菌亚门疫霉属真菌引起的,除危害韭菜外,还危害葱、洋葱、蒜、茄子、番茄等。1、症状韭菜各部位都表现症状,尤为假茎和鳞茎受害最重。叶片上初现水浸状暗绿色病斑,病斑扩展到半个叶片时,叶片变黄,下垂、软腐,湿度大时,病部长出灰白色霉状物,假茎受害呈现浅褐色、软腐、叶鞘易脱落,潮湿时病部也长出灰白色稀疏的霉层。鳞茎被害时根盘呈水浸状,浅褐色至暗褐色、腐烂,纵切茎可见内部呈浅褐色,
Leek disease is an important disease in chive production. Phytonomycosis Phytophthora caused by fungi, in addition to endanger leeks, but also onions, onions, garlic, eggplant, tomatoes and so on. 1, symptoms All parts of the symptoms are symptoms of leeks, especially pseudostems and bulbs most affected. The leaves began to show the appearance of flooding dark green spots. When the lesion extended to half of the leaves, the leaves became yellow, drooping and soft-rotted. When the humidity was high, the disease grew gray-white mildew. Rot, leaf sheath easy to fall off, damp when the disease also grow gray white sparse mildew. When the bulb is damaged, the root disk is soaked, light brown to dark brown, decay, longitudinal cut stem visible internal was light brown,