Cucumber downy mildew is an important disease on cucumbers. Cucumber cultivation in both open and protected areas is common, and the loss of cucumbers in greenhouses and greenhouses is the most serious.

First, symptoms of mildew mainly damage the leaves. At the time of the initial onset, small, yellowish spots of water-soaked leaves appeared along the back of the leaves. As the disease progressed, irregular lesions gradually appeared. When the lesions were wet, the yellow-yellow mold layer grew on the lesions on the back of the cotyledons and the disease became severe when the disease was severe. Spots become large lesions. Diseased leaves develop from bottom to top, and the leaves of the whole plant die when they are severe.

Second, the incidence characteristics of the disease is a disease of Downy fungal infection, mainly by air and rain. High temperature is the most important condition for the occurrence of cucumber downy mildew. More than 83% of the relative humidity of the bacteria can produce sporangia after 4 hours; the sporangium germinates directly, germ tubes emerge, and the host penetrates from the stomata or penetrates the epidermis. The route of transmission is mainly from cucumbers in the greenhouse to cucumbers in the field, then from the field to the summer and autumn cucumbers, and then to cucumbers in the greenhouse.

Third, the use of 72.2 Pu Li Ke agent 800 times liquid, 64% anti-virus WP 1000 times spray or 75% chlorothalonil WP 600 times, 50% TB 800-1000 times, separated 7-10 days once, even spray 3-4 times.

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