QuestionsHow to growFruitApplesfruit trees 0 Vote Up Vote Down Alan Stenson asked 16 years ago do you need to spray every year even if no sign of scab? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago If a tree shows no signs of scab, it may be a resistant variety, such as ‘Discovery’, and does not need to be sprayed.