棚室黄瓜生长点常常会因病虫为害和管理不当出现各种异常症状,甚至生长点消失,严重影响黄瓜正常生长和经济效益,必须给予足够重视。一、黑星病的为害1、症状黑星病主要为害黄瓜的幼嫩叶和生长点。受害轻时烂边的黄瓜叶长成残缺不全或匙状,严重时心叶可在2—3天内烂掉,造成黄瓜秃尖无头。叶片病斑易形成星状穿孔,症状明显,其他病害穿孔没有此现象。一般在幼苗期和结瓜初期容易 Greenhouse cucumbers growing point often due to pest damage and improper management appear all kinds of abnormal symptoms, or even the growth point disappears, seriously affecting the normal growth and economic benefits of cucumber, we must pay enough attention. First, the scab damage 1, scytoderma major symptoms of cucumber young leaves and growth points. Cucumber leaves suffer from light damage to incomplete or spoony, severe heart leaves can rot in 2-3 days, resulting in cucumber bald tipless head. Leaf lesions easy to form star-shaped perforation, the symptoms are obvious, other diseases perforation does not have this phenomenon. Generally easy to seedling and early fruiting