Bark coming off tree - cause and treatment?

We have an autumn blaze maple planted 2.5 years ago. It is 2 inches in caliper now.

It looks healthy except for a spot where the bark is peeling off (pictured). The bark there was brittle and flaked off.

Under the bark we found several insects (also pictured). We've seen these same insects throughout our landscaping. It looks as if they burrowed a hole into the tree.

We're unsure if the insects are the cause of this problem or if there is some other problem that the insects are taking advantage of.

Is this anything to be concerned about, and if so what should we do?


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In late spring, I noticed that our mature pin oak tree had limbs with brown...

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