Last Modified: December 04, 2024

You can look for the Asian longhorned beetle (ALB) and the damage it causes by checking trees on your property and in your community. Adult beetles are most active in the warmer months, but you can see tree damage year-round. Finding and reporting the beetle and tree damage early means saving more trees.

What To Look For

Browse our photo gallery to see the signs of ALB infestation.

Tap any image to view larger size.

asian longhorned beetle on a tree branch next to a dime-sized exit hole asian longhorned beetle egg site shows chewed wounds on the bark of a tree about the size of a quarter or smaller where an egg is laid closeup image of bottom of a cut tree trunk showing tunneling damage from Asian longhorned beetle closeup image of sap weeping from asian longhorned beetle egg site wounds on the bark of a tree closeup image of frass (looks like sawdust) from Asian longhorned beetle damage on a tree trunk and branch group of people looking up at a tree showing dieback, damage caused by Asian longhorned beetle infestation
asian longhorned beetle on a tree branch next to a dime-sized exit hole asian longhorned beetle egg site shows chewed wounds on the bark of a tree about the size of a quarter or smaller where an egg is laid closeup image of bottom of a cut tree trunk showing tunneling damage from Asian longhorned beetle closeup image of sap weeping from asian longhorned beetle egg site wounds on the bark of a tree closeup image of frass (looks like sawdust) from Asian longhorned beetle damage on a tree trunk and branch group of people looking up at a tree showing dieback, damage caused by Asian longhorned beetle infestation

Exit Holes
Round holes about the size of a dime or smaller when the adult chews its way out

Egg Site
Chewed wounds on the bark about the size of a quarter or smaller where an egg is laid

Tunneling
Feeding damage caused by the larva inside the tree as it grows 

Weeping Sap
Tree sap may weep from the egg site wounds on the bark

Frass
Sawdust-like material found on the trunk, branches, or ground

Dieback
Tree health may decline, and branches can die and break off

How You Can Help

Report It

If you think you found a beetle or tree damage:

  • Capture the beetle and freeze it. This helps preserve it for identification.
  • Photograph the beetle or tree damage.
  • Report online or call the ALB hotline at 866-702-9938.

Reduce Spread

If you live in an ALB quarantine, keep the beetle from spreading:

  • Follow State and Federal laws. These laws restrict the movement of woody material. 
  • Do not move any infested tree materials. Instead, call your local eradication program office at 866-702-9938.
  • Allow program officials access to your property for tree inspections, and remove infested trees. 
  • If you need to have tree work done, hire companies with ALB compliance agreements.
  • If you need to dispose of woody materials, call your local eradication program office at 866-702-9938 or contact your municipal office. 

Stay Informed

Keep updated on the latest information. Tell your family and friends about the beetle. Ask them to check their trees, too: