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There are small yellow spots on the cabbage. Can experts please tell me what the disease is?

Cabbage downy mildew. Use 600 times 58% manganese zinc wettable powder, or 500 times 69% manganese zinc wettable powder, or 700 times 80% mancozeb wettable powder, or 600 times 72% manganese zinc wettable powder Powder, or 600 times 50% ethylphosphine aluminum manganese zinc wettable powder, etc. for control, the effect is very good.