Q&A: What Is Causing Trees to Lose Their Bark?

tree with woodpecker damageSeveral observations of tree bark damage like this have been reported to the University of Maryland Extension’s Home & Garden Information Center (HGIC) recently. 

Q: I was walking in the woods near my house and noticed bark trimmed off a tree. It looked like a buck rubbing with their antlers, but it was up high, about 10 feet. A couple weeks later, I was in my back yard and noticed the same thing on one of my trees. Can someone please help me figure out what is going on? Thanks!

A: This looks like damage from woodpecker feeding. Judging from the bark pattern of the tree, this looks like an ash tree. Many ashes in Maryland are becoming infested with the invasive emerald ash borer (EAB). Taking a close look at the photo, it appears there are borer holes in the trunk where the bark was removed. The EAB larvae that feed on the nutrient transporting layers under the bark are a good food source for birds such as woodpeckers. This woodpecker impact is being seen and reported more and more frequently.

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