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Emerald Ash Borer

The Emerald Ash Borer (EAB) has devastated ash trees in southwestern Ontario and parts of the United States since its discovery in Detroit, Michigan in 2002. EAB is an introduced insect pest from Asia that attacks and kills all species of ash (Fraxinus) trees. Note that the mountain ash tree is not a true ash tree (Sorbus americana) and is not threatened by this pest. 

In June 2016, the Emerald Ash Borer was officially confirmed in Thunder Bay. Read the City's news release announcing the discovery: Adobe PDF, 1 page, 128 KB 

The City of Thunder Bay EAB Management Report was brought to Council on July 18th 2016 City of Thunder Bay Emerald Ash Borer Strategic Management Plan 2014

Read the Report to Council: EAB Report to City Council 2016

Public Information Sessions were held in partnership with the Invasive Species Centre on July 19 & 20. Read more: Adobe PDF, 1 page, 324 KB

Renowned scientist, Dr. Krista Ryall, joined the City and Ministry of Natural Resources and Forestry in August to analyze samples from municipal ash trees in Thunder Bay. Read more: Adobe PDF, 1 page, 208 KB

If you think you have found an EAB beetle please call the CFIA at 1-866-463-6017.

 EAB Signs

EAB and Ash Tree Identification Guide Adobe PDF, 1 page, 31 5KB

Pests that are not EAB but look similar: EAB look-a-likes

Great resource link on everything related to EAB, in particular injections/ protecting ash trees: BioForest EAB resourcelinks to external site


EAB is a major economic and environmental threat that has killed more than 20 million ash trees in Ontario. EAB was detected in Thunder Bay on June of 2016. In Thunder Bay, with over 25% of our city's municipal trees (and an unknown number of private trees) being ash, the invasion of this pest is of great concern. Learn how to properly ID ash trees (Fraxinus) and the Emerald Ash Borer beetle and don't move firewood. Let's prevent it's further spread!

Featured Videos

  • EAB - A 2014 Update for Thunder Bay
  • Emerald Ash Borer: For Urban Officials and Public
  • Emerald Ash Borer Video by Natural Resources Canada
  • Oakville's Response to the Emerald Ash Borer
  • Little Things Big Problems Video by National Park Service Great Lakes Restoration Initiative
  • EAB Task Force

    The City of Thunder Bay, together with the Ministry of Natural Resources, Canadian Food Inspection Agency and a number of public, private and non-profit agencies have joined together as the Emerald Ash Borer Task Force Northwestern Ontario to address the threat that EAB poses to Northwestern Ontario. EAB Partners include:

    Task Force Partners

    The EAB Task Force is currently developing strategies for the potential arrival of EAB to the northwestern region which includes:

    • a communications strategy to increase public awareness;   
    • a technical strategy to implement detection methods in the region;
    • a strategy to develop partnerships and garner support.

    What you can do - Tips for Fighting Back Against the Emerald Ash Borer

    • Fight Emerald Ash Borer!Buy local, burn local! The most important action citizens can take is to not move firewood.
    • Don't import ash nursery stock into the region.
    • Tell your friends and pass the word around.
    • Put EAB info into your worksite or club's newsletters and websites (we can supply short articles).
    • Investigate TreeAzin™ and consider injecting your ash trees. TreeAzin™ is a pesticide registered for use in Canada to prevent ash tree damage from EAB. Ash trees that are larger, still healthy and structurally sound are the best candidates for treatment. TreeAzin™ must be injected into the ash tree every two years by a licensed individual, and poses little risk to people, pets or wildlife. It degrades naturally. For more information, visit
    • Plant other species than ash in your yard. Get involved in planting trees in your neighbourhood, or participate in planting programs, such as Thunder Bay's Tree Stewardship Program.
    • If you think you found an EAB beetle, record the location of the tree and the signs and symptoms you observed, collect the EAB specimen and Contact the Canadian Food Inspection Agency at 1-866-463-6017.For more information, please visit the Canadian Food Inspection Agency website (CFIA).