Another job for this time of the year. When your stone fruit starts to look like this, spray with some copper based fungicide. Kocide, Bordeaux, Mancozeb plus. It'll stop a whole range of stuff; leaf curl, freckle, brown rot (I think). It's just the right thing to do - leave it and you'll be looking for fixes in spring and the advice will be "you should've sprayed back at pink tip stage"
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