Spinach downy mildew is mainly harmful to spinach leaves, sick class began to pale yellow dots, the edge is not obvious, gradually produce gray and white mold layer on the back of the lesions, later grayish purple, leaves positive macular. The lesion expands upward from the lower part of the plant. Mainly through the use of air currents, rainwater, agricultural implements, insects and agricultural operations spread. The temperature was heavy at low temperatures and high humidity at 10°C and 85% relative humidity.

1, strengthen the cultivation and management. Rational close planting, scientific irrigation, reduce the humidity in the field.

2, select disease-resistant varieties. Savo hybrids No. 612, Barnti, Bowlas and other famous varieties can be used, and sharp-leaf varieties can also be used.

3. Seed production on disease-free or disease-free plants. If the seeds are borne by bacteria, they can be seeded with 50% methadone WP before sowing. The dosage is 0.4% of the seed weight.

4. In early spring, the diseased plant was found in the field of spinach. It should be removed promptly and brought out of the field.

5. In the early stage of onset, spray 40% EB aluminum wettable powder 200-250 times, 58% metalaxyl, spray 40% EB aluminum wettable powder 200-250 times, 58% metalaxyl manganese zinc WP 500 times, 64% WP 500 times, or 72.2% Proclex 800 times, 58% methadone WP 500 times, or 75% chlorothalonil wettable Powder 600 times, or 75% DuPont dew wettable powder 800 times spray. Spray once every 7-10 days for 2-3 consecutive times.

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