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Asian Longhorned Beetle 
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How does it harm the tree?
Exit Holes caused by the Asian Longhorned Beetle
 Beetle exit holes (E) and where eggs are laid (O) on a maple tree.
Sawdust caused by the Asian Longhorned Beetle
Sawdust from beetles chewing their way out of a tree.
The Asian longhorned beetle is extremely destructive.  The damage is caused by beetle larvae which burrow deep within a tree to feed on its food and water conducting vessels.  Continued feeding causes structural defects and eventually kills the life-sustaining cambial layer by girdling.  Mature beetles then burrow out of the tree leaving holes the diameter of ball-point pens.  Heavy Asian Longhorned Beetle infestations can kill otherwise healthy adult trees.

Above images courtesy US Forest Service

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