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一、黄瓜霜霉病黄瓜霜霉病俗称“跑马干”、“黑毛”(北方)、“瘟病”和“痧斑”(南方)等,是各类温室和大棚黄瓜发生最普遍、危害最严重的病害。1.症状识别本病主要危害叶片。子叶染病后正面初呈褪绿,继而黄化,最后产生不规则的枯黄斑,在潮湿条件下,叶背病部生黑色霉层。真叶发病后,初呈淡黄色或黄绿色圆形斑,扩展后因受叶脉限制,病斑呈多角形,黄褐色或褐
First, the cucumber downy mildew Cucumber downy mildew commonly known as “Happy Horse”, “Black Hair” (North), “Blast ” and “Flamboyant ” (South), is all kinds of greenhouse and Greenhouse cucumbers occur most commonly, the most serious damage to the disease. 1. Symptoms Identification The main hazards of the disease leaves. Positive cotyledons appeared after the beginning of the first chlorotic chlorotic, and then yellow, and finally produce irregular dry yellow spots, wet conditions, the back of the Ministry of disease black mold layer. True leaf disease, the initial pale yellow or yellow-green circular spot, expanded due to the limitations of the veins, lesions were polygonal, brown or brown