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The Emerald Ash Borer (EAB) is a highly destructive insect pest of ash Trees.  Native to eastern Asia, this pest was first discovered in Canada in 2022.  The EAB has killed millions of ash trees in Southwestern Ontario and poses a major economic and environmental threat to urban and forested areas.  The EAB attacks and kills all species of ash (except Mountain Ash, which is not a true Ash).

How does the EAB spread
While the EAB can fly up to several kilometres, another significant factor contributing to its spread is the movement of firewood, nursery stock, trees, logs, lumber, wood with bark attached and wood or bark chips

Signs of Infestation

Tree decline including: 

  • thinning crown

  • diminished density of leaves

  • evidence of adult beetle feeding on leaves

  • long shoots growing from the trunk or branches

  • vertical cracks in the trunk

  • small D-shaped emergence holes

  • S-shaped tunnels under the bark filled with fine sawdust

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