Not an American elm. Leaf is the wrong shape--American Elm leaves typically (not always though) have an asymmetrical base at the leaf stem.Not the best photo, but check out the underside of the top leaf that is left. It looked to be a one bug job, so I shook him away.
There is at least a leaf in focus on the left side. I always assumed this was Siberian elm due to the courser leaves. Any chance it is American?
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That’s an apical sacrifice runner in the foreground.Is that the trunk of the tree or just a vertical branch?