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Phyllocnistis populiella
A beautiful pattern which only can be created by nature. I wonder if the caterpillar knows what it is making.
Thanks John! I have not seen something like this either. The more common ones are the ones on the black locusts where I live in NY.
I saw this this same damage last month in New York. It was also on quaking aspen, and I couldn't recall seeing a leaf miner with such a beautiful feeding pattern.