Reaches of the Emerald Ash Borer

Canadian areas regulated for the Emerald Ash Borer

It would appear that few areas are exempt from the emerald ash borer anymore. The above map is the most recent consolidated area where ash trees are being regulated. No wood, leaves, mulch, sawdust or ash material of any kind may be moved within this regulated area to help prevent the potential spread of this invasive species.

Signs of the EAB

Classic sign of the EAB – ‘D’ shaped exit hole


That being said, quarantine areas do little for the existing ash trees within its bounds. As the emerald ash borer has no natural enemies, once an ash tree is infested  its mortality rate is almost 100%.



Snake-like pattern under the bark of a dead ash tree



There are plenty of signs that point to the presence of the emerald ash borer. Look for a thinning of the tree’s crown, dead branches, and yellowing leaves. Small, ‘D’ shaped holes mark where the adult borers have exited the tree. A peek under the bark reveals the serpentine pathways left behind by the EAB larvae.


Ash Rings

Felled by the EAB

As the emerald ash borer larvae effectively cut the flow of sap to the rest of the tree, it makes the already dry tree extremely brittle and dangerous in urban settings. A dead ash tree poses a risk to any people or structures surrounding it. Without treatment, an ash tree can perish within 2-5 years. As 10% of London, Ontario’s tree canopy is made up of ash, it is a devastating invasion for home owners and the city alike.

Canisters administering ash injections

If you discover the presence of EAB early enough TreeAzin is your only defence


The only treatment available at present is TreeAzin. If you suspect that your ash tree is showing signs of EAB infestation, early detection is key in protecting your tree. An otherwise healthy and mature ash tree is a valuable addition and one worth saving. CLC Tree Services can advise you whether treatment is an option and administer it as needed.


As the ash population across North America is being devastated, that option is small comfort. Learn to recognize the signs of the emerald ash borer. Report any sightings to the Ontario Ministry of Natural Resources or the Canadian Food Inspection Agency. Never move firewood within restricted areas. Do whatever you can to protect our trees and stop the spread of this invasive species today. Please share this information wherever you can and maybe we can all make a difference.


About CLCtreeservices

CLC Tree Services has been providing premiere tree services to London and the surrounding area since 1988. We focus on providing tree services to residential, commercial, property owners and property management agencies. We have the desire, knowledge and equipment to solve all difficult tree problems.
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One Response to Reaches of the Emerald Ash Borer

  1. Pingback: Emerald Ash Borer Workshop in Mount Albert – October 6, 2014 : – Ontario

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