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This is the Damage of the Woodboring beetle. They are very invasive and are the culprits that are causing certain forests to become depleted. There are several different varieties and don't really have that many natural enemies (mostly the imported ones). These Insects are master excavators and chew the layers under the bark layer. This was taken in my backyard in a pile of tree trimmings we did back in the summer of 2014. These markings were found in the Post Oak. The damage is pretty bad and is very concerning to note how many other of my neighborhoods trees have been infected with these creatures.
They live out their lives in all types of trees in woods, backyards, parks and other heavily wooded area around the World from the USA all the way to China.