Pest of the Month May 2012 – Asian Long-Horned Beetle (Pest Alert)

  • Hosts: hardwood trees (primarily genera Acer, Populus, Salix, and Ulmus, but also Aesculus, Albizia, Betula, Cercidiphyllum, Fraxinus, Platanus, Prunus, and Sorbus).  Acer is the most common.
  • Distribution: Native to China and Korea.  First discovered in the 1996.  Has been found in New York, Calfornia, Washington State, Illinois, and New Jersey.
  • Symptoms: Dead trees due to larva tunnels under the bark and deep into the tree.  Early symptoms – sap leaking from the tree, sudden dieback of larger branches.
  • Signs: Round exit holes ~3/8” diameter on trunks and branches, frass at the base of infested trees or branch crotches.
  • Management: ALB is not currently established in the western U.S.  Early detection, reporting, and eradication is important to prevent its establishment.

Source: Regional Pest Alert Asian Long-Horned Beetle (ALB), USDA-CSREES Integrated Pest Management Centers in cooperation with the University of California Statewide Integrated Pest Management Program; the National Plant Diagnostic Network, Western Region; USDA APHIS; USDA Forest Service; California Department of Food and Agriculture; and the Sacramento County Agricultural Commissioner.

Asian Long-Horned Beetle. Photo courtesy University of California, Riverside.