Please ask the experts I cuttings this year's giant grape seedlings now winter buds a lot of dry, and the buds above the white powder-like things, I do not know what is going on?
Infection of grape mildew. Use 600 times 58% methomyl manganese zinc wettable powder, or 500 times 69% allyl manganese zinc wettable powder, or 700 times 80% diclofenac manganese zinc wettable powder, or 600 times 72% frost urea manganese zinc wettable powder, or 600 times 50% ethylphosphine aluminum manganese zinc wettable powder, and so on for prevention and control.