Downy mildew: It mainly damages spinach leaves. The diseased clusters begin to appear as light yellow dots with inconspicuous edges. Gradually, a grayish-white layer of mildew appears on the diseased spots on the back of the leaf, which turns grayish-purple later, and the front of the leaf shows a yellow spot. The lesions spread upward from the bottom of the plant. It is spread and spread mainly by airflow, rain, agricultural tools, insects and agricultural operations. The disease will be severe under the conditions of low temperature and high humidity at 10℃ and relative humidity of 85%.
Prevention and treatment measures: spray with 58% nail cream manganese zinc wettable powder 500 times liquid, or 75% chlorothalonil wettable powder 600 times liquid, or 75% DuPont Kelu wettable powder 800 times liquid.
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