QuestionsHow to growFruitApplesDiseased apple trees 0 Vote Up Vote Down penelope adamson asked 10 years ago Diseased young apple trees? spray with Jeyes Fluid now? wasp nest in compost heap 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 3 years ago Jeyes Fluid is not recommended for use on trees. If you have scab disease, spray at bud break in spring and three or four times more using a garden fungicide, such as Doff Systemic Fungus Control. Wasps will die off when a few frosty nights come along soon.