一、黄瓜黑星病黄瓜黑星病是世界性病害,目前除澳大利亚、南美洲尚未见报道外;已广布欧洲、北美、东南亚。截至1990年我国已有辽、吉、黑、京、津、冀、内蒙、晋、鲁、川、沪、海南等12个省(市·区)的44个城市发生了黄瓜黑星病。黄瓜黑星病是由半知菌类枝孢霉属的瓜疮痂枝孢霉菌侵染致病的,分生孢子梗细长,暗绿色至淡褐色,顶端有短分枝,分生孢子串生,椭 First, cucumber scotch cucumber Scab is a worldwide disease, at present except Australia, South America has not been reported; has been widely distributed in Europe, North America, Southeast Asia. As of 1990, there have been cucumber scab in 44 cities in 12 provinces (cities, districts) of Liaoning, Jilin, Heilongjiang, Beijing, Tianjin, Hebei, Inner Mongolia, Shanxi, Shandong, Sichuan, Shanghai and Hainan. Cucumber scab is caused by the fungus Cladosporium Cucumber Cladosporium Cladosporium infection pathogenic, conidiophore slender, dark green to pale brown, the top short branches, conidia sprouting ,oval