There are 3 things going on there i think. Scab , Fabraea, and what looks like the beginning of trellis rust though that is to be determined. i believe the problem is not the disease but rather i think your tree needs a fertilizer containing boron. Are any leaves showing a slightly crinkled appearance? @Richard that looks like a mineral ddefficiency to me and the diseases are just oppurtunistic. Any thoughts on fertilizer?
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