Asian Longhorned Beetle - Find It

Look for Signs of Damage

Besides seeing the beetle itself, there are distinctive signs that can be found on a tree that may mean your tree is infested, and if you see a beetle or suspect that tree damage is caused by the ALB, please report it by calling the hotline at 1-866-702-9938 or filling out the online Report It form:

• Exit holes – In the warmer months the adult beetles chew their way out of the tree leaving, ¼ inch or larger, perfectly round exit holes.
• Egg sites – Adult female beetles chew up to 90 oval depressions, called oviposition sites or egg sites, into the bark of the host tree. She lays a single egg beneath the bark at each site. These look like little wounds on the tree, and you can sometimes see the chew marks on the edges.
• Frass – As the larvae tunnel and feed, it often pushes sawdust-like material or excrement, called frass out onto the ground around the tree or onto the tree branches.
• Tunneling – After the egg hatches, the larva tunnels into the growing layers (phloem and cambium) of the tree and eventually into the woody tree tissue (xylem). If you have a fallen branch or are cutting wood, you may see this tunneling.

Other Signs of Damage

• Weeping sap – Tree sap may be seen flowing from the wounds or egg sites.
• Unseasonable yellowing leaves – Seeing leaves turning colors sooner than they should could indicate the tree is under stress.
• Branches dropping or dying – If the tree has lost a branch or has a dead branch showing it could be a sign that something is wrong.