黄瓜霜霉病和靶斑病都会产生黄色斑点,症状容易混淆,给正确防治带来一定的难度。现将这两种病害的特征特性以及不同的用药除治方法介绍给大家,供参考。一、霜霉病病症该病是一种发生发展速度很快的真菌性病害,整个生育期均可发生,主要对叶片造成危害。开始先在叶背产生浅绿色小斑点,后逐渐扩大变为黄褐色,病斑受叶脉限制呈多角形,潮湿时叶片背面产生灰黑色霉层,后期病斑相连,造成 Cucumber downy mildew and target spots will produce yellow spots, the symptoms easily confused, to bring the correct control of a certain degree of difficulty. Now the characteristics of these two diseases as well as the characteristics of different methods of treatment introduced to you for reference. First, the downy mildew disease The disease is a fungal disease occurs very fast development, the entire growing period can occur, the main harm to the leaves. Began to produce light green small leaf spot on the back of the first, then gradually expanded into a brown, lesion was polygonal polygons restricted by the leaves, when wet leaves gray black mold layer, the latter lesion connected, resulting