Summer pruning sometimes results in the production of new fruit spurs. These spurs will produce flowers the following spring, followed by fruit. If you tip-prune the branches that have fruit forming on them in the summer, you'll encourage new fruit spurs. All you have to do is to remove about 4" of growth from the ends of branches on which fruit is growing. You're not pruning to shape the tree, only to encourage the growth of new fruiting wood. If your tree has produced new branches that don't have fruiting spurs, you can cut them back in the summer to encourage the same results.
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