黄瓜疫病俗称死秧或死藤,是一种危害严重、难以控制的普遍性病害。温室大棚温、湿度管理不善,或露地夏、秋黄瓜浇灌过量,受害往往比较严重,常会造成大面积死秧、烂瓜,产量直接减少20%以上。发病原因:引起黄瓜疫病的病原菌为鞭毛菌亚门真菌德氏疫霉(图1),其菌丝无色多分枝,幼菌丝无隔,老熟菌丝长出瘤状节结或不规则球状体,内部充满原生质。在瓜条上菌丝球状体大部分成串,常在发病初期孢子囊未出现前产生,从此长出孢 Cucumber blight commonly known as dead seedlings or dead vine, is a serious and difficult to control the general disease. Greenhouse greenhouse temperature and humidity management is poor, or open-field summer and autumn cucumber over-irrigation, victims are often more serious, often resulting in large areas of dead seedlings, rotten melon, the output directly reduced by 20%. The cause of the disease: Cucumber blight caused by the pathogen Flammulina fungus Phytophthora pasteurophila (Figure 1), the mycelium colorless multi-branched, mycelium without the septum, mature mycelium nodules or irregular nodules Spheroid, internal full of protoplasm. Most of the mycelium spheroids in the melon strung, often in the early onset of sporangia did not appear before, grow spores