Asian Longhorned Beetle

Asian Longhorned Beetle FAQ

Learn about the Asian Longhorned Beetle, an invasive species that affects a variety of trees in Ontario.

Q: What is the Asian Longhorned Beetle?
A: It is an insect that was imported in the early 1990s from Asia into the United States. It was originally found in the Toronto/Vaughan area in 2002. It was thought to have been eradicated by the Canadian Food Inspection Agency in May 2013, however there was a new sighting of ALHB in the fall of 2013 near Pearson International Airport.

Q: How does the Asian Longhorned Beetle affect the tree?
A: Eggs hatch in the summer/fall and larvae tunnel into the trunk or limbs creating tunnels in the tree.

Q: Which trees are affected by the Asian Longhorned Beetle?
A: Mainly Birch, Maple, Elm, Hackberry, Horse Chestnut, Mountain Ash, Poplar, Sycamore and Willow.

Q: What will happen to an infested tree?
A: The tree will die.

Q: What signs should I look for in my trees?
A: Weeping sap on the trunk of the tree in mid-summer to early fall. You will see holes in the bark of the tree about the size of a dime if your tree is infested.

Q: What is the prevention or treatment?
A: At this time there is no registered treatment.

Q: Where is the Asian Longhorned Beetle active?
A: City of Mississauga and City of Toronto near the Pearson International Airport.

If you believe your trees could be infested with the Asian Longhorned Beetle or if you have any inquiries, please contact us!


The above is general information and does not try to address or endorse any particular product or activity related to the pests as they affect trees.