Author: Kyla Hardon

The City of Edmonton has confirmed one elm tree in both the Northmount and Rossdale neighbourhoods has tested positive for Dutch elm disease (DED). These two trees mark the eighth and ninth cases of Dutch elm disease confirmed in Edmonton since it was first detected in 2024. 

“These cases were identified by our integrated team of arborists, urban foresters and pest management biologists as they continue intensified surveillance and testing of elm trees across the city. We continue removals, daily assessments and testing in coordination with the province and Canadian Food Inspection Agency,” said Nicole Fraser, Acting Director, Parks and Urban Forestry.

The two trees were in decline and proactively removed as part of the ongoing efforts to contain the spread of the deadly fungal disease. Prompt tree removal is essential to maintain the health and safety of the urban forest.

Both trees were on City property. One of the trees was in the established DED Protocol Zone in the Northmount neighbourhood. The other tree was located in the Rossdale neighbourhood. The Protocol Zone has been expanded to include a one-kilometre radius around both locations. These Zones are established in areas where DED has been confirmed to allow for heightened monitoring, assessments and tree maintenance.

Dutch elm disease is a contagious fungal infection that spreads easily to nearby elms. The disease poses a significant threat to Edmonton's urban forest, where elm trees make up 22 per cent of the City’s Open Space and Boulevard Tree Inventory, or approximately 90,000 in total.

Promptly removing infected trees and any elms within 20 meters of them, alongside a diligent pruning program to clear deadwood, is necessary to reduce habitats for the beetles that spread the fungus.

All pruned elm wood is disposed of at the Edmonton Waste Management Centre, following strict, specialized handling procedures.

July 14, 2026 - The City of Edmonton announced two additional positive cases for DED.   These two trees mark the eighth and ninth cases of Dutch elm disease confirmed in Edmonton since it was first detected in 2024.  Both trees were on City property, one inside the DED Protocol zone in Northmount and the other nearby in Rossdale (with an expanded protocol zone around each find).

The City is reminding residents about DED protocols including pruning ban, signs of the disease, non-movement of firewood and how to report suspected trees.

More info can be found in the news release here.

Time to check the elms for DED symptoms
How we can stop DED
- Check your elm trees for DED symptoms and report immediately to the STOPDED hotline at 1-877-837-ELMS
- Adhere to the annual pruning ban from April 1 to September 30th.
- Respect provincial regulations by not moving or storing elm firewood. Spores of the DED fungus are dispersed via bark beetles that burrow under the bark and lay their eggs. DED can be distributed over long distances in elm logs and in firewood.

Symptoms of infected DED elm tree: 
Flagging - when the leaves of one or more branches near the top of the tree wilt, curl, turn yellow and then brown, remaining on the tree.

Staining - an infected twig sample will have red streaks through the sapwood. https://www.alberta.ca/dutch-elm-disease-overview.aspx

There are other vascular elm diseases which are not as serious as DED and mimic the symptoms of DED. For this reason, a sample from the infected area of the tree must be sent to the Alberta Plant Health Lab to confirm if DED is present. A confirmed DED tree must be removed and disposed of properly immediately to prevent further spread. https://www.alberta.ca/dutch-elm-disease-overview.aspx

Firewood is confiscated from travelers at all the AB/US borders. There is one volunteer firewood bin east of Medicine Hat at the Dunmore vehicle and boat inspection site.

What Has Changed?
The Canadian Food Inspection Agency (CFIA) has expanded the regulated areas for Dutch elm disease to include all of Saskatchewan and parts of south-central British Columbia (Kootenay region – near Castlegar) as of June 16, 2026.

This expansion is a response to recent detections of DED in Saskatoon (2025) and British Columbia (2024).

Why Is This Important for Alberta?
Alberta remains a DED - free province, and these new movement restrictions are specifically designed to protect Alberta’s trees and urban forests from the spread of this destructive disease.

The restrictions help prevent the movement of potentially infected elm wood, nursery stock, and bark beetles from newly regulated areas into Alberta.

Keep Calm and Carry-on
Municipalities, landscapers, and tree buyers in Alberta can be reassured that proactive steps are being taken to keep DED out of the province.  This includes the Clean Plants program, as well as firewood collection movement restrictions.

There may be increased public and media attention about DED, but the CFIA has provided clear contacts for information and support to reduce confusion or panic.

https://inspection.canada.ca/en/plant-health/invasive-species/plant-diseases/dutch-elm-disease

Alberta buyers should continue to source elm trees only from approved, DED-free suppliers and follow any updated guidance from the CFIA or provincial authorities.

Support and Communication
The CFIA encourages anyone with questions or concerns to reach out directly to their local inspection manager or use the provided contact information for technical support.

Ongoing updates and resources are available on the CFIA website to keep Alberta stakeholders informed or through StopDED (https://www.alberta.ca/society-to-prevent-dutch-elm-disease)

The expansion of regulated areas in Saskatchewan and BC is a precautionary measure to protect Alberta’s valuable elm trees and urban forests. Alberta residents and the horticultural industry should remain vigilant but reassured that strong safeguards are in place to prevent the introduction and spread of Dutch Elm Disease into the province.