Emerald Ash Borer (EAB) Plan

With the EAB firmly established in Guelph, there are an estimated 10,000 City-owned street and park trees that are at risk. The City of Guelph has developed a plan to handle the EAB infestation of City-owned ash trees over the next 10 years. The EAB plan is not about fighting the EAB infestation–it is about reducing the risk of personal injury and property damage, minimizing damage to the urban forest, and “sowing the seeds” of recovery.

Guelph’s EAB plan includes the treatment, removal and replacement of City-owned ash trees. The estimated cost to manage the infestation is between $15-16 million over the next 10 years.

The basic principles of the plan are to:

  1. Ensure safety of people and property, as they relate to dead or dying City-owned ash trees.
  2. Reach out to the community to ensure they are aware of the issue, their options, and how to access their options.
  3. Treat as many ash trees as feasible, but only invest in the very best candidates. Feasibility here includes both financial and biological constraints.
  4. Set recovery into motion as quickly as possible, even before ash-tree decline, if possible.
  5. Protect natural areas from ecological degradation caused by EAB infestation.
  6. Leave infested but “green” City-owned ash trees standing as long as they are safe to stand, to gain the longest “service life” from each mature ash.

City-owned ash trees showing signs and symptoms of EAB infestation will ultimately be removed and replacement trees will be planted. Trees will only be removed when they are dead or in serious decline, maximizing the service life and environmental benefits of the trees. Forestry staff will make every effort to preserve trees whenever possible to maintain our tree canopy, as per the City’s Urban Forest Management Plan.

Ash trees not showing signs of infestation will be assessed for possible treatment with TreeAzin®, a natural pest control product registered under the Pest Control Products Act for use against the emerald ash borer. TreeAzin is currently being used with success by several of Guelph’s neighbouring municipalities, the Grand River Conservation Authority, and private landowners.

The City will coordinate its EAB mitigation efforts with agencies such as the Canadian Food Inspection Agency, the Canadian Forest Service, the Ontario Ministry of Natural Resources, Grand River Conservation Authority, Wellington County and neighbouring municipalities.

City of Guelph EAB Plan

For an accessible version of the City of Guelph EAB Plan please contact Timea Filer at 519-822-1260 extension 3352 or timea.filer@guelph.ca

For more information

Timea Filer
Urban Forestry Field Technologist
Parks and Recreation
519-822-1260 extension 3352