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主要症状:主要表现在植株上部叶片上,上午8～9点观察很明显,叶背面有水浸状病斑,受叶脉限制呈多角型,上有黑霉层。发病条件:气流传播,低温高湿(16～22℃,80%以上),叶片结露,最适病害的发生蔓延。病菌怕高温,27℃存活5～10天,45℃存活2小时。1 生态防治1.1 黄瓜生长的前期,应保温、提温、降湿,中期应重点放风降湿,尽量控制棚内的温湿度,不能同时出现16～22℃和80%以上湿度的现象,结露时间不超过2小时,避免和减少病害的发生机率。
Main symptoms: mainly in the upper leaves of plants, the morning of 8 to 9:00 was observed, the back of the leaf has a flooded lesion, restricted by the veins polygonal, there is black mold layer. Disease conditions: airflow, low temperature and humidity (16 ~ 22 ℃, 80%), leaf condensation, the occurrence of the most appropriate disease spread. Bacteria are afraid of high temperature, 27 ℃ survive 5 to 10 days, 45 ℃ survive 2 hours. 1 ecological control 1.1 cucumber growth early, should heat, temperature, dehumidification, the mid-point should focus on wind and humidity, as far as possible to control the temperature and humidity within the shed, not at the same time appear 16 ~ 22 ℃ and 80% humidity above the phenomenon of condensation Time does not exceed 2 hours to avoid and reduce the incidence of disease.