Check Your Pool Filters for Asian Longhorned Beetle

Look for this invasive insect in your pool this summer.
Adult Asian Longhorned Beetle

We need your help to look for Asian longhorned beetles (ALB). UNH Extension is asking New Hampshire residents with pools to check their filters regularly for ALB. Pool filters naturally gather an assortment of bugs making it easier to keep an eye out for ALB. If you don’t have a pool you can still help!

ALB was first found in Worcester, Mass., in 2008, but experts estimate it was in the trees for about 10 years before they identified the problem. Luckily, this invasive beetle has not been found in New Hampshire. However, we need your help! If it is found in New Hampshire, we need to take steps to stop the spread as soon as possible.

ALB poses a serious risk to trees and forests because it attacks many kinds of hardwood trees. The white-spotted sawyer beetle is a common and native look-alike often confused for ALB. However, there is a fool-proof way to tell the two apart.

How can I help look for ALB?

What you Need:

  • A smartphone (or other mobile device) or digital camera.
  • An email address that you actively use.
  • A computer to upload pictures to our online reporting system.

Step 1: Search your pool filter for Asian longhorned beetle

ALB adults are active during the summer, mid-July through the end of August. Whenever you clean your pool, look at the debris you collect in your filter and skimmers. Look for longhorned beetles.

Step 2: Compare what you find to insects similar to ALB

Use a fact sheet to compare collected insects to common insects.

Step 3: Take a picture

Take a picture of any insect you think is a longhorned beetle. We need a good view of the insect's back to properly identify it.

Step 4: Send us your pictures

Upload pictures of the insect using the online reporting form.

We will post interesting pictures and sightings online at in our photo gallery. Find more information about Asian longhorned beetle and other invasive insects at