Insect

Asian Long-horned Beetle

The Asian long-horned beetle (ALHB) is native to China and Korea, where it's considered a forest pest as well. ALHB was accidentally introduced in to Canada in the 1990s via untreated shipping pallets. It infests all deciduous trees, but prefers native maple species. ALHB has been detected in Ontario, but has not been detected in PEI to date.

Identification

Here are some key features that may help to positively identify the Asian long-horned beetle:

Adult beetles:
  • 2-4 cm long
  • Have shiny, black backs with irregular white patches
  • Black and white banded antennae that are roughly 1-2 times the length of the body
  • Bluish legs
  • Females lay chew oval oviposition pits (about 10 mm wide) into the bark and lay a single egg in this cavity. Oviposition pits can occur from ground level up into the crown. Frothy, white sap may exude from recently created oviposition pits. (Canadian Food Inspection Agency)
  • Adults create a small hole in trees when exiting, approximately 1 cm across
  • Feed on leaves and twigs of host trees
  • Larvae hatch and begin tunneling through the host tree, destroying living tissue and stopping the flow of nutrients and water, leading to tree mortality
ALHB Symptoms:
Image gallery
ALHB. Photo by Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
ALHB. Photo by Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
ALHB. Photo by Melody Keena, USDA Forest Service, Bugwood.org
ALHB. Photo by Melody Keena, USDA Forest Service, Bugwood.org
ALHB exit hole. Photo by Bruce Gill, Canadian Food Inspection Agency
ALHB exit hole. Photo by Bruce Gill, Canadian Food Inspection Agency
ALHB oviposition pit on Manitoba maple, Acer negundo. Photo by Erin Appleton, Canadian Food Inspection Agency
ALHB oviposition pit on Manitoba maple, Acer negundo. Photo by Erin Appleton, Canadian Food Inspection Agency
ALHB damage. Photo by Thomas B. Denholm, New Jersey Department of Agriculture, Bugwood.org
ALHB damage. Photo by Thomas B. Denholm, New Jersey Department of Agriculture, Bugwood.org
ALHB damage. Photo by Dennis Haugen, USDA Forest Service, Bugwood.org
ALHB damage. Photo by Dennis Haugen, USDA Forest Service, Bugwood.org
Lily leaf beetle adult. Photo by Green Thumb Photography.
Lily leaf beetle adult. Photo by Green Thumb Photography.
Lily leaf beetle adult feeding damage. Photo by Green Thumb Photography.
Lily leaf beetle adult feeding damage. Photo by Green Thumb Photography.
Lily leaf beetle maturing eggs. Photo by Green Thumb Photography.
Lily leaf beetle maturing eggs. Photo by Green Thumb Photography.
Lily leaf beetle feeding larvae. Photo by Green Thumb Photography.
Lily leaf beetle feeding larvae. Photo by Green Thumb Photography.
Lily leaf beetle larva mature. Photo by Green Thumb Photography.
Lily leaf beetle larva mature. Photo by Green Thumb Photography.
Lily leaf beetle feeding damage to plants. Photo by Green Thumb Photography.
Lily leaf beetle feeding damage to plants. Photo by Green Thumb Photography.
Lily leaf beetle eggs, damage, young larvae. Photo by Green Thumb Photography.
Lily leaf beetle eggs, damage, young larvae. Photo by Green Thumb Photography.