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Emerald Ash Borer

Emerald ash borer (EAB) is an invasive species with the potential to devastate the ash tree population. Emerald ash borer larvae feed on the inner bark of ash trees, limiting the tree’s ability to transport water and nutrients. This damage accumulates and kills the tree.

It is estimated that ash trees make up 20% of Moose Jaw’s urban forest. The Parks and Recreation Department currently monitors for the presence of EAB using green prism traps located in areas of high ash density around the city. These traps are hung in the trees from late May to the end of August. EAB has not been found in Saskatchewan. It was confirmed in Winnipeg in November 2017.

What can I do?

  1. Don’t move firewood. Transporting wood helps invasive species and diseases spread. All firewood should be bought and burned locally.
  2. Identify the trees in your yard. If you have ash trees, monitor them for signs and symptoms of EAB. If you suspect that your ash tree may be infected, contact Parks and Recreation at recreation@moosejaw.ca or (306) 694-4439.
  3. Learn more about EAB at http://www.emeraldashborer.info

How to Identify Ash Trees

Ash trees have opposite buds that are either brown or black. Opposite means that the buds and leaves always occur in pairs. Ash leaves a pinnately compound, meaning they are made of many small leaflets attached to the leaf’s mid rib in pairs. Ash are slow to leaf out in the spring and one of the first trees to drop it’s leaves in the fall. More pictures of ash trees can be found on our ash tree page.

Signs and Symptoms of Emerald Ash Borer

  1. Dieback starting from the top of the tree
  2. Increased wood pecker damage
  3. D- shaped exit holes
  4. S-shaped galleries underneath the bar
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Photo Credentials

Adult emerald ash borer: Brian Sullivan, USDA APHIS PPQ, Bugwood.org

Ash leaf: City of Moose Jaw

Ash dieback and woodpecker damage: Steven Katovich, USDA Forest Service, Bugwood.org

Emerald ash borer exit hole and larva galleries: Troy Kimoto, Canadian Food Inspection Agency, Bugwood.org

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