Asian Longhorned Beetle

Asian longhorned beetles (Anoplophora glabripennis) are large, wood-boring beetles that can destroy

Adult Asian longhorned beetle

 many hardwood tree species. They have not been found in Wisconsin to date, and the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) has imposed an exterior quarantine to help prevent their introduction to the state.

ALB attacks maple, elm, birch, poplar, willow and many other hardwood trees. It tunnels and feeds under the bark, disrupting water and nutrient flow. This weakens the wood and eventually kills the tree. ALB is native to China, Japan and Korea.

The beetles are dark with white spots, with very long antennae. They resemble the pine sawyer, which is native to Wisconsin. When adult ALB exit hole next to a dime for comparisonbeetles chew their way out from under the bark, they leave exit holes that are 3/8 inch in diameter. 

Infestations in Illinois and New Jersery have been eradicated. However, there are currently ALB infestations in Ohio, Ontario, Massachusetts and New York. 

If you suspect you have found ALB, collect a sample of the insect and/or affected wood, and contact plant health authorities in any of these ways:

  • DATCP (866) 440-7523

  • USDA-Animal and Plant Health Inspection Service (608) 286-3604

    Online reporting form 

Quarantine requirements 

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