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China cabbage has small yellow spots on it. What's wrong with it?

Downy mildew of cabbage. Using 600 times of 58% mefenacet wettable powder, or 500 times of 69% dimethoxymancozeb wettable powder, or 700 times of 80% mancozeb wettable powder, or 600 times of 72% mefenacet wettable powder, or 600 times of 50% ethidium aluminum manganese zinc wettable powder, the control effect is very good.