What varieties of appletreesdo you have that you find are the most disease resistant to things like scab, rust, fire blight. Where did you get these varieties?
I have a few young trees. The Ruby Mac seems to be doing the best so far for disease resistance, though I don't know if that will always be the case.
Here in Washington State, my experience has shown that Liberty, Freedom, Dolgo crabapple, Gravenstein, and Enterprise have all been good choices. Winesap apples too, and cider apples in general that I've seen.
When you reach your lowest point, you are open to the greatest change.
-Avatar Aang