Spindle galls, most likely caused by the eriophyid mite.
I've seen a lot of this on Black cherry leaves. This is what you have there, yes? So I looked around to find the best, most compact description. Found here: https://nhgardensolutions.wordpress.com/tag/plants/ was;
Finger galls on the leaves of black cherry (Prunus serotina) are caused by a tiny eriophyid mite (Eriophyes cerasicrumena.) Visually these galls aren’t very appealing but they don’t hurt the tree. They are small-maybe as long as a half inch. A blue butterfly called the cherry gall azure (Celastrina serotina) lays eggs on these finger galls in May, and when they hatch the resulting caterpillars eat the galls-mites and all. The caterpillars also leave behind sweet secretions that attract ants. The ants, in return for the sweets, protect the cherry gall azure caterpillars from wasps and other predators. Imagine-all of this happens on the surface of a single leaf.
Started by Ben T. in Woodlot Management. Last reply by Patrik Schumann on Tuesday. 1 Reply 0 Likes
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Started by Carl Albers in Woodlot Management Dec 31, 2023. 0 Replies 0 Likes
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Started by Carl Albers in Woodlot Management Dec 31, 2023. 0 Replies 0 Likes
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Started by Peter Smallidge in Woodlot Management Nov 28, 2023. 0 Replies 0 Likes
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Started by Brett Chedzoy in Woodlot Management Aug 8, 2023. 0 Replies 1 Like
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Started by Jeff Joseph in Woodlot Management. Last reply by Jeff Joseph May 5, 2023. 2 Replies 0 Likes
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Started by Brett Chedzoy in Woodlot Management May 2, 2023. 0 Replies 0 Likes
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Started by Brett Chedzoy in Woodlot Management Apr 20, 2023. 0 Replies 0 Likes
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