QuestionsHow to growVegetable GrowingPotatoespotato blight 0 Vote Up Vote Down liz durkan asked 15 years ago What best to spray with used to use dithane, gone off market 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Dithane is still approved for sale at the moment. Try Liquid Copper or Bordeaux mixture.