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 trees. EAB is a major economic and environmental threat that has killed more than 20 million ash trees in Ontario. Let's prevent its further spread! Use our EAB and Ash Tree Identification Guide to find them and check our EAB Look-alikes first to make sure.

Call if you find them

If you think you have found one, please call the Emerald Ash Borer hotline at 1-866-463-6017.

Don’t move firewood

The EAB can hitchhike on the firewood. Don’t Move Firewood can help you learn how you can protect trees from invasive bugs.

In Thunder Bay

We detected EAB in Thunder Bay on June of 2016. Over 25% of our City's municipal trees being ash, not including any privately owned trees, the invasion of this pest is of great concern.

Our Adopt a Tree Program

The Emerald Ash Borer Adopt a Tree program gives you the opportunity to sponsor the treatment of City owned ash trees. View our Emerald Ash Borer Adopt a Tree Program Poster or our Emerald Ash Borer Adopt a Tree Program Flyer to see what you need to know before submitting your request.

Program steps

  1. Contact or call City dispatch 625-2195 to inquire about sponsoring the treatment of a City owned ash tree.
  2. City Forestry staff will contact you to discuss the Adopt a Tree process and review any tree assessment or site information available for this location.
  3. If the information available rules out the potential for treatment (tree has a poor assessment rating, etc.) the process will end at this point.
  4. If the tree appears to be a candidate, we will arrange a site visit to confirm the assessment and look for any other potential site considerations that might affect approval and if pruning is required prior to injection.
  5. If approved, we will issue the approval in writing, schedule any required pruning and let you know whom to contact to schedule the injection treatment.
  6. Once the injection treatment is completed, the contractor will provide you and the City a record confirming of the work.
  7. You will be required to apply again in two years’ time to initiate the next required treatment, which will follow the same process.

Mountain ash tree

The EAB does not threaten the mountain ash, as it is not a true ash tree (Sorbus sp.).


Use these great resources on everything related to EAB, including particular injections and protecting ash trees:

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:

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