Help Protect Alberta's Elm Trees

Dutch elm disease (DED) is one of the most destructive tree diseases in North America, and while Alberta remains largely free of the disease, preventing its spread depends on everyone doing their part.

DED is caused by a fungus that blocks an elm tree's ability to move water and nutrients. Once infected, an elm tree can decline rapidly and die, with the disease spread primarily by elm bark beetles that carry the fungus from tree to tree.

One of the most important ways Albertans can help is by following the annual elm pruning ban, which is in effect from April 1 through September 30. During this period, fresh pruning cuts attract elm bark beetles, increasing the risk of infection. Routine pruning should only be done between October 1 and March 31.

Another common way the disease spreads is through the movement of elm firewood. Beetles can hide beneath the bark of infected wood and be transported long distances by unsuspecting campers and homeowners. It is illegal to bring elm material into Alberta from provinces where Dutch elm disease is present, such as Saskatchewan. Wherever you camp, remember to buy it where you burn it and avoid transporting firewood.

Property owners can also help by keeping elm trees healthy through proper watering and maintenance. If an elm tree becomes infected with Dutch elm disease, the wood must be disposed of immediately by burning or burying in accordance with provincial requirements. Elm wood cannot be stored, and infected wood cannot be chipped.

If you notice an elm tree with wilting, yellowing or browning leaves, don't ignore it. Early reporting is critical to preventing the disease from spreading.

To report a suspected case of Dutch elm disease, contact the STOPDED Hotline at 1-877-837-ELMS (3567).

By following a few simple rules, Alberta residents can help preserve one of the province's most iconic urban tree species for future generations.

More information at > Government of Alberta - Dutch Elm Disease Prevention