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、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 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. Symptoms of various parts of the leek show symptoms, especially pseudostem and bulb most affected. When the leaf spot was expanded to half a leaf, the leaves turned yellow and soft rot. When the humidity was high, the disease department grows gray-white mildew. The damage of the pseudostem presents light brown, soft rot, Sheath easily shed when wet