黄瓜黑星病系检疫性病害。一旦发生,危害大,难防治。此病除危害黄瓜外,还危害冬瓜、南瓜。症状黄瓜的叶、茎、花均可受害。叶片染病,始为褪绿色圆形斑,渐病部变黄,后病部破裂穿孔,并呈星芒状开裂。茎染病,病斑长圆形或梭形,初为水渍状褪绿斑,渐变黄褐色,凹陷龟裂,高湿时病部长出灰黑色 Cucumber black star disease quarantine disease. In the event of a great harm, it is difficult to prevent and cure. In addition to the disease cucumber disease, but also endanger melon, pumpkin. Symptoms Cucumber leaves, stems, flowers can be affected. Leaf disease, began to fade green round spot, gradually getting sick yellow, after the Ministry of rupture perforation, and star-shaped crack. Stem infection, lesion oblong or fusiform, early as water stains like faded green spot, gradient tan, depression cracks, high humidity when the Minister of gray out of black