Emerald Ash Borer

The Emerald Ash Borer (EAB) is an invasive species that is native to Asia that attacks and kills ash trees. They were first detected in Canada in 2002 but it is likely that they were here 4 to 5 years before that.

Adult beetles are metallic blue-green in colour and have a narrow, elongated body (8.5 – 14.0 mm) and a flat head. When the adults emerge from under the bark they leave a “D” shaped exit hole in the trunk.

The larvae feed on the inner bark and sapwood of the ash trees leaving “S” shaped galleries. The larvae are 26-32 mm long and a creamy white colour with a flat, broad shape. It is the larvae that do the most damage, essentially cutting off the flow of nutrients in the tree, eventually killing it.

Signs that your trees are infested include:

  • Irregular notches in leaves created by the immature beetles feeding
  • Vertical cracks in the trunk
  • Thinning crown
  • Epicormic shoots
  • Callus tissue may be produced by trees in response to feeding
Have an Emerald Ash Borer problem? Call to find out how TreeAzin can help your trees.