If you think your apple tree has a disease, the first step is to identify the symptoms. Once you know what's wrong with your tree, you can take steps to treat the problem. Here are some common apple tree diseases and how to get rid of them:
Apple scab is a fungal disease that causes brown or black spots on the leaves and fruit of apple trees. To control it, remove infected leaves from the ground and spray your tree with a fungicide in spring.
Cedar-apple rust is another fungal disease that affects both apples and cedars. It causes orange or yellow spots on the leaves of affected trees. To get rid of it, prune away infected branches and spray your trees with a fungicide in spring.
Fire blight is a bacterial disease that can kill entire branches of an apple tree. The best way to control it is to prune away any infected parts of the tree. You should also remove any fallen leaves or fruit from the ground around the tree. If fire blight is severe, you may need to use a chemical bactericide.
Powdery mildew is a fungus that covers leaves and fruit with a white powdery growth. It's especially common in humid weather conditions. To get rid of powdery mildew, start by pruning away any affected parts of the tree. Then, spray your tree with a fungicide every 7-10 days until the problem clears up