Site Accessibility Information Access Key 1 to Skip to Top Navigation Access Key 2 to Skip to the Three One One link Access Key 3 to Skip to City of Winnipeg Main Menu Access Key 4 to Skip to Left Navigation Menu Access Key 5 to Skip to Content area Access Key 6 to Skip to Right Sidebar content area Access Key 7 to Skip to Footer Links
Insect Control

Asian Longhorned Beetle

What are Asian Longhorned Beetles?

asian longhorned beetle

Asian Longhorned Beetles (ALHB) are a serious pests of hardwood trees. Tunneling in the wood by the larvae can girdle tree stems and branches. Repeated attacks lead to dieback of the crown and eventually, death of the tree.

Where do ALHB live?

They are native to Asia, but presently they are undergoing eradication efforts in New York City and Chicago areas.

What type of trees do they destroy?

Maple, poplar, willow, birch, elm, ash, and horse chestnut.

What do Asian Longhorned Beetles look like?

asian longhorned beetle
  • The adult has a shiny black body (2 to 3.5 cm long) with white spots.
  • Antennae are longer than the body with alternating black and white bands.
  • Legs are black with pale bluish sections.
  • Larvae and pupae are hidden inside the host tree within tunnels bored by the larvae.

How do I know a tree is being attacked by the ALHB?

  • Round holes in the bark approximately 1 cm across, bored by the emerging adult.
  • Oval to round pits or niches in the bark made by the adult female to deposit her eggs.
  • Sap that oozes from the egg laying pits as the larvae feed.
  • Accumulation of sawdust (from the boring larvae) around the base of infested trees as well where stems and branches meet.

What is the lifecycle of the ALHB?

ALHB usually has one generation per year depending on the regional climate. Eggs as well as larva and pupa can overwinter. Overwintering larvae begin to feed in March and pupate in June with emergence of the adult from host trees in June or July, remaining active into October. Adults can be seen actively feeding and mating in the tree canopy during sunny days from 8:00 to 14:00. Adults will feed on leaf stalks, leaves, young bark or twigs. The female adult can produce approximately 25-32 eggs, which she lays in niches or pits she excavates in the bark.

How does the beetle spread to other areas?

On its own, adults can fly hundreds of feet, which is increased when wind aided. More importantly people transporting infested firewood can unintentionally spread ALHB.

How can ALHB be controlled?

You can help control the ALHB by looking for signs of infested material in wood piles. If you plan on moving firewood, nursery stock or logs inspect them for signs of the ALHB. If you see signs do not move the infested material.

If you think you have found the ALHB you should:

  • Record the location of the tree,
  • Record the Signs and Symptoms you observed,
  • Collect an adult specimen, keep it in a container in a freezer (to preserve it), and
  • Contact the Canadian Food Inspection Agency or call 1-800-442-2342.

Last update: July 20, 2020
Contact Us
311
or 1-877-311-4WPG
Media inquiries: 204-986-6000
311@Winnipeg.ca

Administrative Office and Research Laboratory
1539 Waverley Street
Winnipeg MB R3T 4V7

Operations Base
3 Grey Street
Winnipeg MB R2L 1V2
Citizens' Information Service
Search by address
to find out your insect management area.

Was this information helpful?

How can we make this web page better?

Information collected will be used to improve our website. Do not use this form to submit a request for service or information because it will not be forwarded to departments for response. To submit a request for service or information, contact 311.

This form is not intended to collect personal information; however, any personal information you choose to include in your comments is collected by the City of Winnipeg under the authority of section 36(1)(b) of the Freedom of Information and Protection of Privacy Act for the purpose of improving our website and will not be used or disclosed for any other purposes, except as authorized by law. Contact the Corporate Access and Privacy Officer by mail (City Clerk’s Department, Susan A. Thompson Building, 510 Main Street, Winnipeg MB, R3B 1B9) or by telephone (311) if you have any questions about the collection of this information.

Ces renseignements sont-ils utiles?

Comment pourrait-on améliorer cette page Web?

Les renseignements recueillis serviront à l’amélioration de notre site Web. Prière de ne pas se servir de ce formulaire pour soumettre une demande de service ou de renseignements, car la demande ne sera pas transmise au service en question. Pour soumettre une demande de service ou de renseignements, veuillez communiquer avec le 311.

Le présent formulaire ne vise pas à recueillir des renseignements personnels. Cependant, les renseignements personnels que vous choisissez d’inclure dans vos commentaires sont recueillis par la Ville de Winnipeg en conformité avec l’alinéa 36(1)b) de la Loi sur l’accès à l’information et la protection de la vie privée dans le but d’améliorer son site Web et ne seront ni utilisés ni divulgués pour d’autres raisons, sauf dans les cas où cela est autorisé par la loi. Communiquez avec l’agent de l’accès à l’information et de la protection de la vie privée de la Ville par courrier au Bureau du greffier, immeuble Susan-A.-Thompson, 510, rue Main, Winnipeg (Manitoba) R3B 1B9, ou par téléphone au 311 si vous avez des questions sur la collecte de ces renseignements.