Disease? - help please Cherry tree - young - just planted -

Can anyone please tell me what this is and if I need to treat the tree.
Thank you in advance

Looks like a leaf miner

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Hi Hillbilly,
I agree with your diagnoses, it caused me to go check my young potted Pawpaws that have a leaf problem. Here is a pic of several leaves I removed. Not sure what it may be or best remedy. When I first noticed it I thought it may be sun burn. So I placed them under my persimmon tree canopy. One plant has lost most of its leaves. Looks a bit like Phyllosticta leaf spots? Do you recognize this issue?