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黄瓜“死藤”是由疫病引起的。在夏季,黄瓜很易受此病的侵害;特别是盛夏气温高、湿度大的时候,此病发生更为普遍。染病黄瓜的蔓茎及嫩茎节部先出现暗绿色水渍状,后萎缩变细,使病部以上的瓜蔓萎蔫,最后全株枯死。 该病是由甜瓜疫霉病菌侵染引起的,病菌可随风、雨或流水传播蔓延,进行重复浸染。只要环境条件适宜,该病流行速度极快。适宜该病发生的最适环境温度为23～32℃,夏季雨后暴晴时病势发展迅猛,稍有不慎即会危害全田。盛夏高温干旱若浇水过多过勤此病发生也较为严重。
Cucumber “Death Vine” is caused by the disease. In the summer, cucumbers are very vulnerable to the disease; especially in midsummer, when humidity is high, the disease is more prevalent. Cucumber cucumbers and tender stem section first appear dark green water-like, after shrinking thinner, so that the disease above the melon wilted, and finally the whole plant died. The disease is caused by the infection of Phytophthora meliloti, the bacteria can spread with wind, rain or running water, repeated dip. As long as the environmental conditions are right, the epidemic is extremely fast. Suitable for the occurrence of the optimum temperature of the environment is 23 ~ 32 ℃, the rapid development of the summer storm after the rapid development of the disease, a little careless that will endanger the whole field. High temperature and drought in midsummer If excessive watering over the incidence of the disease is also more serious.