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.