Asian longhorned beetle: An unwanted invasive species

The Asian longhorned beetle (ALHB, Anoplophora glabripennis) is a highly destructive wood-boring pest of maples and other hardwood trees including poplar, birch and willow. ALHB infests and kills healthy trees, devastating urban and rural communities.

Adult beetles are 20–35 mm long, shiny black, with up to 20 white spots on each wing cover.

Signs and symptoms

Thinning crowns/dead branches.
Sawdust and wood shavings (frass).
Egg laying sites created by females chewing into the bark.
Galleries and tunnels under the bark. Cracked or missing bark.
Round exit holes (6-14 mm) made by adult beetles emerging from the trees.
Foamy or frothy sap
running from recent egg laying sites.
New (reddish brown) and old (dark) egg laying sites.
Note teeth marks.

ALHB is native to Asia and can be introduced into Canada with infested wood packaging material (e.g. wooden pallets, crates, boxes, etc.). Once in a new environment, ALHB can disperse naturally or spread long-distance through transport of infested wood products including firewood and logs.

You can help protect your community from this invasive insect:

  • check trees for evidence of ALHB
  • collect suspect ALHB specimens, if found
  • report suspect ALHB or ALHB tree damage to 1-800-442-2342
  • don't move firewood

Not Asian longhorned beetle

Banded alder borer

  • Native to BC
  • Similar in size to ALHB, but flattened and has alternating transverse black and gray bands
  • 20 to 35 mm long
Banded alder borer

Western conifer-seed bug

  • Across Canada
  • Reddish-brown to gray-brown
  • Pines and leaf pattern on legs
  • Up to 20 mm long
Western conifer-seed bug

Pine sawyers

  • Across Canada
  • Brown or black but not shiny
  • Wing covers appear pitted, not smooth like ALHB
  • Smaller (18 to 27 mm) than ALHB
Pine sawyers

More information

Photo credits

  • M. Bohne
  • D. Cappaert
  • D. Haugen (Bugwood.org)
  • N. Wright
  • K. Bolte
  • B. Gill
  • T. Poiré
  • L. Schimming
  • M.T. Smith
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