I can diagnose your plant with a cute case of little guy infestation

Google Lens suggests a Tent Catapiller.

Kill them with fire.

Tent caterpillars larva will kill your tree and then come back the next season to kill the trees around them.

I remember our yard absolutely teeming with tent caterpillars as a little kid. Cute little guys--I remember I'd pet them because they were soft and fuzzy. I did freak out when I discovered their defense mechanism: vomiting up their stomach contents, which manifested as a green or red bubble the size of their heads. I thought I'd accidentally squished them at first and was really upset!