I just checked Gene Logsdon's ORGANIC ORCHARDING. Boy, do I love having my books back on shelves! After he gives the varying orchardist's opinions, he ends with, "Or you can, without too much fear, follow the old orchardists' wry advice: Prune when your pruning knife is sharp."
My personal experience is that modern trees are so vigorous in growth, and likely I feed and water them too much, that pruning needs to be done on a year-round basis or they become unmanageable.
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