冬季大棚黄瓜栽培中,烂头现象很多。黄瓜烂头指植株顶部的“龙头”新叶出现腐烂黄瓜烂头主要由以下三种疾病引起。黑星病主要危害黄瓜的生长点,几天内即可造成心叶枯萎。叶片病斑形成星状穿孔,症状明显,其它病害穿孔没有此现象。茎部病斑龟裂,往往有胶质物流出。瓜条上病斑有透明胶状物流出,后成疮痂状。无论茎上或瓜条上,湿度大时, Winter greenhouse cucumber cultivation, many rotten phenomenon. The rotten cucumber is the root cause of rot on the top of the plant. The rotten cucumber is mainly caused by the following three diseases. Scrophulariaceae cucumber main damage to the growth of the point, a few days can cause heart wilt. Leaf spot formation star-shaped perforation, symptoms are obvious, other diseases perforation does not have this phenomenon. Stem spot cracked, often out of gummy material. Melons on the spots have a transparent jelly outflow, scab formation after the scab. Regardless of the stem or melon, humidity,