Asian Longhorned Beetle Surveys Underway

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Provided by Prince William County

During the winter, the Prince William County (PWC) Mosquito and Forest Pest Management Branch (MFPM) monitors locations across the County for evidence of any possible Asian Longhorned Beetle (ALB) presence. Currently, the beetle is not present in Virginia, but infestations have occurred in New York, New Jersey, Massachusetts, Illinois, Ohio and South Carolina.

ALB is a large (1-1.5 inches) beetle with long antennae. Its body is black with white spots. The beetles prefer maple trees, but other hosts include ash, birch, sycamore, willow and elm. In the larval and pupal stages, they bore through the tissue under the bark creating galleries. Once adult beetles are ready to emerge, they chew their way out of the tree, leaving a round, dime-sized exit hole.
ALB adult activity peaks in the summer and early fall. MFPM conducts visual surveys during the winter because signs indicating an infestation are easier to spot when the trees are without leaves. Common signs of ALB include the dime sized exit holes, egg laying sites (small depressions in the bark) and frass deposits around the base of the tree. PWC residents can help by looking for such evidence year-round, especially on unhealthy and dying trees.
MFPM is currently finalizing the data from the i-Tree forest inventory analysis conducted across the County, which will help identify areas at high-risk for ALB and other forest pests.
If you suspect an infestation or have questions, please contact the MFPM office at (703) 792-6279 or

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