No1. Choose resistant varieties if possible.
There are so many varieties of apple who are resistant to scab. you can chose them to save you money and time for controlling disease apple varieties like Green Smith, American, and Amberi have a good resistance to scab.
No2. Decomposition of fallen fast.
Apply nitrogen to leaves that have fallen to the ground in the fall to enhance decomposition of fallen leaves and make them more palatable to earthworms.
3. Pruning
Prune your apple tree summer as well as in winter as your apple trees to open up branching and allow more air circulation
4.Rake under trees
Rake under trees and destroy infected leaves to reduce the number of fungal spores available to start the disease cycle over again next spring. Spread a 3- to 6-inch layer of compost under trees, keeping it away from the trunk, to cover soil and prevent splash dispersal of the fungal spores..
5. The Spry schedule
The best way to control scab is as its first stage you have to spray 4 fungicide before apple reach to size of pea in spring time you have to spray for wood then pink buds then leaf tip and sharp after petal fall. ( Condition apply if weather remain good)
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