Bronze Birch Borer (Agrilus anxius)
- Mitch Stainer
- Mar 4
- 2 min read
Bronze Birch Borer in Lethbridge: What YOU Need to Know
If you have a Birch tree in Lethbridge, you need to be aware of Bronze Birch Borer — It is a beetle that can quickly kill weakened Birch trees. If you look around the city you will notice many of the Birch trees are already suffering and experiencing die back. This pest is becoming more common in our area, and early detection is key to saving your trees.
What is Bronze Birch Borer?
Bronze Birch Borer is a small, metallic-colored beetle that lays eggs on the bark of Birch trees. When the larvae hatch, they tunnel under the bark, damaging the cambium layer and cutting off the tree’s ability to transport water and nutrients. This slowly leads to branch dieback and, eventually, tree death.
Signs of an Infestation
Thinning Canopy – Upper branches start to die off - When the tree starts budding and leaves start appearing you may notice a lack of Green on the tips and/or browned leaves.
D-shaped Exit Holes – Small, D-shaped holes on the trunk from adult beetles emerging - This may also leave a rusty looking residue on the bark.
Raised Bark or Cracks – Larvae tunneling beneath the bark creates visible damage.
Increased Woodpecker Activity – Birds feeding on larvae can indicate an infestation.
How to Protect Your Birch Trees
Keep Trees Healthy – Stressed trees are more vulnerable, so water and mulch regularly.
Prune Dead or Infested Branches – Removing affected branches Below the infestation can slow the spread.
Consider Preventative Treatments – Insecticide treatments may help protect your Birch trees.
Replace with Resistant Species – If removal is necessary, consider replanting with a more pest-resistant tree.
If you think your birch trees are at risk, Wessex Tree Care is here to help! Contact us for an assessment, and let’s keep Lethbridge’s trees healthy.
Mitch Stainer
(250) 533-9654
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