Alberta's Elms Under Siege: Deadly Fungus Spreads

The presence of Dutch elm disease (DED) is causing alarm across Alberta, with recent confirmations bringing Edmonton's total to 17 cases since 2024. This deadly fungus threatens all elm species in the province, with approximately 900,000 municipal elms at risk, a canopy valued at an estimated $2 billion. Efforts to combat DED are intensifying, with increased monitoring for the banded elm bark beetle, identified as the primary vector.

Transporting firewood is recognized as the most common way infected beetles travel, posing a significant risk to healthy trees. DED invades a tree's vascular system, ultimately killing it within a year. Alberta and Newfoundland and Labrador are currently the only DED-free jurisdictions in Canada. However, heightened vigilance has been in place since 2020 when two cases were detected in Lethbridge, marking the disease's return to Alberta after more than two decades.

In response, 122 Alberta municipalities are coordinating surveillance through the Society to Prevent Dutch Elm Disease (STOPDED). Municipalities are implementing enhanced monitoring, including the use of sticky traps near elm trees and surveys for signs like yellowing leaves. If DED is detected, a provincial response plan is activated, involving the immediate removal and inspection of surrounding trees. Additionally, STOPDED has posted signs at 21 provincial border entrances to deter travelers from bringing firewood into Alberta.