What is causing cankers on my vine maples?

I have 7 vine maples that are growing in three areas in my yard. 4 years ago we cut one down because the bark started to peel and the tree looked like it was dieing. It looked like birds were pecking at it and pulling little chunks of the bark off in small strips. Then it scabs over and looks bad. Now we have it on all of the vine maples and I cant figure out what is causing this to happen. I would like to send a photo of the problem if that would be possible.

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jmelees says

5 years ago
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