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Home > For Residents > Parks And Forestry > Urban Forest > Emerald Ash Borer > Signs of Infestation

Emerald Ash Borer

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Tree Infected with Emerald Ash

How do I know if my ash tree is infested?

There are multiple signs of emerald ash borer in ash trees including the following:

  • The top leaves of trees infected will start to die.
  • The trunks and branches will show D-shaped holes where the beetles exit.
  • Vertical splits may occur in the bark.
  • Dense shoots grow low on the trunk of the tree.

Unfortunately there are no first-year signs of emerald ash borer infestation.

For more detailed information please contact the Canadian Food Inspection Agency at 1-800-442-2342 or The Ministry of Natural Resources