Is this leaf miners? Came out of an orchard in Northern Illinois.
If I zoom in I can see little black dots all around the leaf. I wonder if that is a clue.
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Or could it be a nutrition deficiency? Or early stages of black spot?
Not leaf miners .
I think mites .
Get a magnifying glass, look under leaf’s .
High mite populations are usually cased by spraying chemicals that kill their natural predators
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Thanks Hillbilly, the leaf is from a friends commercial orchard. So your analysis could very well be correct.
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