The disease & pest ID thread has gotten unwieldy; I don’t even know how to post on it!
So, see photo for issue on 6 year old Sierra Beauty. Google was absolutely useless. It just doesn’t look like the general fall decline of leaves I usually see. Northern Nevada.
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It’s some nutritional chlorosis I think, but what the cause is I don’t know. Iron deficiency is a common reason but what caused the iron shortage? I’m sure there are other causes of chlorosis (magnesium, potassium deficiency?).
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All of mine browned out on the edges after my last fungicide treatment. But the interiors are still very green. I sprayed because some were getting a yellowing leaf spot.
Do you use any sort of tree fertilizer on your trees during the year? Have you done a soil sample?
I use a 6-8-12 mix in spring that has a wide mineral spectrum. With a bit of yellowing I poured a wet 5-5-5 mix at the middle of august.
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I had a pear tree with discoloring like that last year. This year those leaves do not look like that at all. They just look like regular fall leaves.