A gall – but from which species of insect is another question entirely. To find that out would require the ID of the host plant & maybe its regional location.
Edit: Peach-leaf gall is usually caused by the final species Taphrina deformans, which also causes leaf curl in the tree.
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A gall – but from which species of insect is another question entirely. To find that out would require the ID of the host plant & maybe its regional location.
Edit: Peach-leaf gall is usually caused by the final species Taphrina deformans, which also causes leaf curl in the tree.