Emerald Ash Borer

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What is Emerald Ash Borer?

Emerald Ash Borer (EAB) is an invasive pest that has been in North America since 2002, and was discovered in Winnipeg in 2017. 

What types of trees are at risk from EAB?

EAB attacks trees from the Fraxinus genus. This includes the Green, Black & Mancana Ash, but NOT Mountain Ash.

How do I know that I have an Ash tree?

All 3 varieties of Ash have similarities, and some distinct differences. They all have opposite bud arrangements, but the twigs of the Green Ash are thinner than the Black & Mancana. They have compound leaves that measure 15-30 cm long, and with 5-13 leaflets on each one. The bark is quite similar across the 3 trees, as well as the seeds.

What are the observable symptoms of an EAB infested tree?

There are several signs to alert you to an infestation; small D-shaped exit holes in the trunk, excessive woodpecker feeding, bark splitting, partially eaten leaves, crown dieback, new shoot growth from the base of the tree.

What do I do if I see these symptoms?

Contact us to evaluate your tree. It might not be too late to save it.

Do I need to protect my tree?

If your Ash tree has not been attacked, and you don't want to lose it, then you MUST treat your tree to prevent it dying.

How is EAB spread?

EAB travels locally by flying, but humans give it the opportunity to travel huge distances. Firewood is one of the biggest threats to the rapid spread of this pest, but any piece of Ash tree (logs, chips, branches and even nursery stock) can harbour insects as it travels.

What can I do to help control EAB?

Report any symptomatic trees to your local forestry authority, don't transport Ash trees, or wood, in any form. Treat valuable trees to keep the species alive, and remove & replace trees that don't offer any value to you or your property. 

What trees are suitable to replace Ash trees with?

There are many options for replacements, despite our Cold Hardiness Zone! Book a planting consultation to determine the best need for you and your landscape.

Emerald Ash Borer - picture credit City of Waterloo