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,还危害大葱、洋葱、大蒜、茄子、番茄等。一、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,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 Leek disease is an important disease in chive production. Phytonomycosis Phytophthora caused by fungi, in addition to endanger leeks, but also endanger the onions, onions, garlic, eggplant, tomatoes and so on. First, the symptoms Leek all parts of the performance symptoms, especially pseudostems and bulbs most affected. The leaves appeared flooded dark green spots, lesion extended to half of the leaves, yellow leaves, drooping, soft rot, humidity, the disease grow gray-white mildew, false stems appear light brown brown