Asian Long-horned Beetle
Asian long-horned beetle (ALHB) is an invasive forest pest with no natural enemies in North America that attacks nearly all broadleaf trees, with native Maples being the preferred host. It was introduced to North America in the 1990′s through untreated wooden shipping pallets. Adults lay their eggs in hardwood trees, and larvae then tunnel through the living tissue of the tree stopping the flow of water and nutrients, killing it. There have been very few sightings of ALHB in Ontario and it is important to be on the lookout for this dangerous invader. Several native non-harmful beetles can be easily confused with ALHB, so take a close look at how to identify this beetle listed below.
Asian long-horned beetle is native to China and Korea where it is considered a major pest causing mortality of Elm, Maple, Poplar and Willow trees. Since arriving in the US, populations have been confirmed in New York, Illinois, New Jersey, and Ohio. In Canada, ALHB was confirmed in an industrial park in the Toronto area in September 2003. By November 2003 susceptible host trees were being removed from the area to eliminate possible ALHB habitat. Currently, ALHB has not been found anywhere in Ontario since 2007, indicating that early detection and rapid response have been effective.
Impacts of Asian Long-horned Beetle
- Insecticides do not protect trees; trees must be cut down and burnt or chipped.
- Easily transported in firewood, live trees or untreated lumber.
- Potential decline in hardwood (broadleaf) trees could have major consequences for Ontario’s wildlife and biodiversity, negatively affecting future generations.
How to Identify Asian Long-horned Beetle
- Adults are 2 – 4cm (¾ – 1½ inches) in length.
- Shiny black with prominent, irregular white spots.
- Distinct bluish-white legs
- Long, black and white banded antennae, one to two times its body length.
- Adults leave a round exit hole, approximately 1 cm across (slightly smaller than a dime) in trees.
What You Can Do
- Learn how to identify adult Asian long-horned beetle and what infested trees look like, as well as which host trees they target.
- Don’t move firewood or other potentially infested wood material over long distances. With firewood, remember: burn it where you buy it!
- If you see ALHB or signs of infestation, call the Ontario Ministry of Natural Resources at 1-800-667-1940 or the Canadian Food Inspection Agency at 1-800-442-2342.
- Report sightings to the Invading Species Hotline 1-800-563-7711 or online .
- Invasive Species: A Threat to Ontario’s Biodiversity
- Canadian Food Inspection Agency
- United States Department of Agriculture
- Invasive Species Centre