Spinach downy mildew mainly harms the leaves. The lesions are light green dots at the beginning, the edges are not obvious, and they are irregular after expansion. The sizes are different, the diameter is 3~17 mm. When the humidity is high, the gray moldy layer is formed on the lesions on the back of the leaves. , after the grayish purple. The lesion spreads upward from the lower part of the plant. When the drought is dry, the diseased leaves are yellow, and when the humidity is high, the leaves are rotted. The whole plant with heavy disease turns yellow and die, and the vegetable plants are atrophic.

At the beginning of the disease, 80% triethylphosphonate or 64% frost·manganese zinc wettable powder + new high fat film 800 times liquid is sprayed once every 7 days, and continuous prevention and control is 2~3 times, which can effectively control the damage of downy mildew. The concentration of the liquid can be appropriately increased when spraying on a heavily infected plot, but not excessively to avoid causing phytotoxicity. At the same time, it can be combined with spraying foliar fertilizer and plant growth regulator Zhuanglingling for prevention and treatment. The critically ill areas should be rotated for 2~3 years to strengthen the cultivation and management, to achieve appropriate density, scientific irrigation, and reduce the humidity in the field.

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