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Emerald Ash Borer and Private Trees

What you need to know:

  • EAB affects only Ash (Fraxinus spp)
  • Both healthy and weakened trees are attacked
  • EAB attacks trees of all sizes from 1 cm and larger
  • Infected trees die quickly and become hazardous
  • Insects do not discriminate between trees on City property and private property – they attack all Ash trees
  • You are responsible for trees on your private property
  • Do not plant ash trees


Protecting ash trees on private property

We are in a critical stage of this infestation right now. If action is taken now, there is a chance you could save your tree for the foreseeable future and defer the high cost of tree removal. However, treatment is most successful if done from June to August.

What you can do:

  1. Determine if you have an ash tree on your property.
  2. Measure the size of your tree. Measure the trunk diameter at chest height. If the tree is > 25cm, it may be a candidate for treatment.
  3. Determine if the tree is healthy. Look to see that there are leaves in at least 70% of the crown. Call a certified arborist to determine if it is a candidate for treatment.


Resources for Homeowners

The following are links for more information on Emerald Ash Borer and possible treatments:


Canadian Food Inspection Agency (CFIA)

Ontario Ministry of Natural Resources (OMNR)

Emerald Ash Borer

Tree Canada

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