Last day to prune Elm trees before ban to prevent Dutch elm disease
MEDICINE HAT, AB. – The last day to prune elm trees until the fall is today, Saturday March 31, 2018.
Across Alberta, the pruning of elm trees is prohibited from April 1 to October 1 each year to reduce the risk of Dutch elm disease (DED). The fungus attacks Siberian and American Elm trees and the Banded Elm Bark Beetle can be a carrier for DED.
The fresh cuts made from pruning elm trees can attract the beetles who may be carrying the disease and increase the chance of spreading the infection. The beetles are most active from the spring to fall period and all dead or dying branches need to be pruned prior to the ban.
If a tree is infected with DED, a mature elm tree can die within a months time.