Dutch elm disease
Dutch elm disease (DED) is a disease of all elm trees. It is caused by a fungus (Ophiostoma spp.) carried as spores on the body of three species of bark beetles. These spores then spread into and infect the walls of the water transport system (xylem) triggering the trees’ defense mechanism.
Signs and symptoms to look for:
Drooping and yellowing of tree leaves on top of tree canopy on one or more major branches. Will dryout become brown and remain on the tree.
No leaves on one or more branches.
Round exit holes roughly 1/16” diameter or size of pencil lead with sawdust accumulating on bark.
Edmonton, Calgary, Lethbridge call or report online 311
All other jurisdictions, contact Provincial STOPDED Hotline:
1-877-837-ELMS (3567)
Report suspected trees
Dutch elm disease Information
DED Provincial Prevention Program:
Federal Regulation:
Effective management of DED includes:
restricted pruning periods from October 1 - March 31. Immediately dispose of any elm wood by burning, burying, or chipping.
burn firewood where you buy it; do not transport firewood.
care of elm trees includes watering from April to mid-August.
