Today marks the first day of Tree Check Month—the annual campaign to check for signs of Asian Longhorned Beetle (ALB). ALB is an invasive insect that feeds on certain hardwood trees, eventually killing them. ALB is most active during the summer and fall, which makes the signs of ALB infestation easier to spot. It’s important to routinely check trees for disease and pests to prevent the spread of them to other trees.
If you spot any of the following signs on your trees, they may be affected by ALB. Once a tree is infested, it must be removed to prevent it from infecting other trees. Thousands of trees have already been lost to ALB, making it important to stay proactive in identifying the signs.
Signs of ALB
- Exit holes: Adult beetles chew their way out of the tree, leaving one-quarter inch exit holes.
- Egg Sites: Female beetles chew up to 90 oval depressions, called oviposition sites, or egg sites, into the bark of the host tree, and then lay a single egg beneath the bark resembling a wound on the tree.
- Frass: As the larvae feed they leave a sawdust-like excrement on the ground or branches.
- Tunneling: Larva tunnel through the layers of the tree.
- Dead branches: If the tree has lost a branch or has a dead branch showing, it could be a sign that something is wrong.
There are certain trees that are prone to the pest. If you have any of the following trees it’s especially important to routinely check them.
Trees at Risk
Missed our first post about ALB? Catch up on it here.