I apologize for this delayed reply to your gardening question and hope it is still helpful to you. I bet you are seeing the shallow holes of the sapsucker bird. These are typically about as wide and as deep as a pencil eraser and are arranged in horizontal lines as if a machine gun shot the tree! There is no cause for alarm if the damage is minor and the tree will not be significantly harmed.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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