Emerald Ash Borer
Almost 180,000 ash trees in Oakville are at risk from the Emerald Ash Borer (EAB), an invasive insect from Asia. EAB larvae eat the soft wood under the tree’s bark, preventing the tree from moving water and nutrients between its roots and leaves, and killing it within one to three years. EAB has killed millions of ash trees in southern Ontario and the eastern United States since its discovery in 2002.
What the town is doing
Oakville has the most aggressive management plan in Canada to combat EAB. Town Council approved a plan to treat 75 per cent of the public ash canopy (approximately 6,000 town-owned trees) on streets and in parks with TreeAzin™, a biological insecticide. To protect resident safety and property, the town will remove the remaining 25 per cent of the public ash canopy over the next few years and replace it with trees of different species.
To ensure your safety, dead and dying ash trees destroyed by EAB are being removed starting November 1, 2012. View the closure schedule on the temporary woodland parks closures page.
Public ash trees receive treatment if they:
- Do not have cracks or holes in their trunk and if 70 per cent or more of their upper branches are healthy. TreeAzin™ is effective at protecting trees that meet these criteria. If a tree is unhealthy or has cracks or holes, treatment is unlikely to prevent it from dying from EAB infestation.
- Are at least 20 centimetres in diameter at the point on their trunk about 1.3 metres from the ground (diameter-at-breast-height or DBH). The town has determined that it is more cost-effective to remove and replace ash trees that are under 20 centimetres DBH than to treat them.
To see whether the public ash trees in your neighbourhood are receiving treatment, visit the public tree inventory and maps page.
You may be able to see faded green dots on the trunks of public trees that are being treated. Trees scheduled for removal are marked with an orange X. Forestry staff has also put up bright green prism traps in ash trees throughout the town to monitor the EAB population in Oakville.
For more details about EAB management in Oakville:
- 2012 Emerald Ash Borer Update Report (pdf, 644 kB)
- Oakville's response to the Emerald Ash Borer Part 1 (video on towntv)
- Oakville's response to the Emerald Ash Borer Part 2 (video on towntv)
What you can do
We need your help to protect Oakville’s tree canopy. Eighty per cent of the treatable ash canopy in Oakville is located on private property. Ash trees that are still healthy and structurally sound can be saved if residents choose to treat them. If you have an ash tree on your property, it is important to take action now. Signs of EAB usually only become apparent once a tree is heavily infested, at which point treatment becomes much less effective. This year may be your last chance to begin treating your ash tree before it becomes heavily infested.
If your tree is healthy, you have two options: 1) Treat your tree, or 2) Remove and replace it with a different species. Doing nothing may put you and your property at risk, and the longer you wait to make a decision, the more likely it is that your tree will become too infested to treat.
For more information, visit the managing EAB on your property web page.
Get involved and stay informed!
Join the Oakville Canopy Club! Like us on Facebook and follow @OakCanopyClub on Twitter for the latest news and information about EAB in Oakville, and tell as what you’re doing to protect Oakville’s canopy. Plus, browse pictures, event announcements and useful information about tree care and protecting our urban forest.
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Be a Canopy Club Champion! Organizations, residents and community groups can adopt healthy, structurally sound, town-owned ash trees that are under 20 centimetre DBH, and therefore ineligible to receive treatment through the town.
Step 1: Contact the town’s EAB management team at 905-845-6601, ext. 3467 or 3849 and tell them which trees you want to adopt
Step 2: Town forestry staff will inspect the trees to determine if they are healthy and structurally sound
Step 3: Download, complete and submit the agreement for contractors to perform arborcultural services on town property (pdf, 90 kB)
Quarantine on ash and ash materials
The Canadian Food Inspection Agency (CFIA) has taken action to limit the spread of EAB by issuing a ministerial order to prohibit the movement of firewood of all tree species, and ash tree products such as nursery stock, logs, branches and wood chips, into or outside regions infested by EAB. For an up-to-date map of infested areas, visit the CFIA website.
All of the greater Toronto area is inside an infested area, but regions to the north and east may not yet be infested. Take care not to transport firewood into these areas (eg. when visiting cottage country or camping north of the GTA).
For more information, view the following pages:
Can't find what you're looking for?
Email us at firstname.lastname@example.org or call our EAB Management Team at 905-845-6601, ext. 3467 or 3849
Content courtesy of the Town of Oakville website at http://www.oakville.ca
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