Hi George
If your trees are pretty old some of them will go to a bi-annual bearing state. They will only bear fruit every other year. Your pruning has little or no effect when your trees hit this age. A commercial orchard depends upon yearly high yielding trees to remain profitable. They pull out thier trees and replace them evevy 6 to 7 years. Of course they also miss out on some great tasting apples.
If you're not sure if they are getting their pollen spread you could always light candles, play soft music and pollenate by hand.





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