Dutch Elm Disease Surges in Regina, Prompting Annual Pruning Ban
Regina is grappling with a significant rise in Dutch elm disease (DED) cases, leading to heightened concerns among city officials and residents alike. The fungal infection, which devastates elm trees, has reached unprecedented levels in recent years, prompting urgent action to protect the urban canopy.
Symptoms and Early Detection
Ashley Thompson, the City of Regina's manager of parks and technical services, emphasizes the importance of early detection. "Leaves will start wilting, turning brown, and they'll hang on to the tree. They won't drop," Thompson explained. "That's the tell-tale sign." With Dutch elm season approaching, residents are encouraged to familiarize themselves with these symptoms to identify potential infections promptly.
Provincial Pruning Ban Takes Effect
Saskatchewan's province-wide ban on pruning elm trees begins this Wednesday, April 1, and will remain in effect until August 31. This annual restriction is designed to limit the spread of DED, which is primarily transmitted by elm bark beetles. The beetles are attracted to freshly cut branches, making pruning during this period particularly risky.
Record-Breaking Infection Rates
The city recorded its highest-ever number of DED cases in 2025, with 87 trees testing positive. All infected elms were subsequently removed and destroyed to prevent further contamination. This total surpassed the previous record of 85 cases in 2024, which was more than double the 24 cases reported in 2023.
Historically, Regina averaged about a dozen infected trees per year, with only 192 cases recorded between 1981 and 2023. The recent spike represents a dramatic shift in the disease's prevalence.
Widespread Impact Across the Region
Dutch elm disease has also emerged in significant numbers at Wascana Park, where the Provincial Capital Commission confirmed 20 cases last year. This marks a substantial increase compared to five cases in 2024 and zero in the four years prior. Thompson noted that the increase is concerning, suggesting it may represent a new normal for the region.
"It seems to be happening everywhere," she said, highlighting similar rises in Saskatoon and Moose Jaw. Edmonton reported its first sighting of the fungus in 2024, indicating a broader regional trend.
Potential Causes and Contributing Factors
Several factors may be driving the surge in DED cases:
- Weather Conditions: Mild winters without prolonged cold snaps may have failed to control beetle populations, while wet springs could facilitate the fungus's movement through trees' vascular systems.
- Public Awareness: Increased reporting and detection efforts might contribute to the higher case numbers, as residents become more vigilant.
- Transmission Methods: The disease spreads easily through interconnected root systems, contaminated pruning tools, or elm bark beetles drawn to cut branches.
Regina's Elm Tree Population at Risk
According to the city's most recent inventory in 2025, approximately 30% of Regina's 179,000 trees are elms. This translates to roughly 56,000 elm trees vulnerable to infection, with older neighborhoods like Cathedral and Lakeview being particularly susceptible due to their mature tree populations.
The city's parks department is urging residents to exercise extra diligence this year to help limit the loss of these valuable mature trees. Proactive measures, combined with adherence to the pruning ban, are essential to mitigating the disease's impact and preserving Regina's urban forest for future generations.
