Dutch elm disease is the biggest threat to Edmonton's elms. Knowing the signs and the rules helps protect these valuable trees. Here is what it is, how to spot it, and how Alberta's elm pruning ban fits in.
Dutch elm disease is a deadly fungal disease that clogs an elm's water system and can kill a mature tree in a single season. It is spread by elm bark beetles and by root grafts between neighbouring elms.
Alberta has worked hard to stay largely free of the disease, which is why the province enforces strict rules, including a ban on pruning elms in the warmer months when beetles are active. Protecting Edmonton's elm canopy depends on everyone following them.
Leaves that yellow, wilt and curl in summer, often on one branch first.
Whole branches of brown, dead leaves while the rest stays green.
Brown staining in the wood under the bark of affected branches.
A healthy-looking elm can go downhill within weeks.
Small holes and galleries left by elm bark beetles.
Untreated, the disease usually kills the tree.
Edmonton's elms are decades of growth we cannot easily replace. Here is why the rules matter.
Every job is planned and led to International Society of Arboriculture standards.
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Our crew does the job safely with the right equipment.
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Alberta bans elm pruning from April 1 to September 30 to keep beetles away from fresh cuts.
Because the beetles that spread Dutch elm disease are drawn to fresh pruning cuts in warm weather, elms may only be pruned in late autumn and winter. Keeping elms healthy, pruned in the legal window, and disposing of elm wood properly is the best defence. If you suspect the disease, do not prune in summer. Contact us or the City, and we can assess the tree and plan action. See our elm pruning service.
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