GFM Network News


Elm pruning ban now in place

The pruning ban for elms is now in effect. The ban is part of an effort to keep Dutch elm disease (DED) out of Alberta. Any pruned elm branches or firewood should have been burned, buried, or chipped by March 31. “If elm trees are pruned during the pruning ban period, beetles that are active […] Read more

Tree pruning is a good thing when done properly

When done properly, pruning will produce strong, healthy, and attractive trees. “However, before pruning a tree, you need to understand why, when, and how to prune,” said Janet Feddes-Calpas, Stop Dutch Elm Disease (STOPDED) co-ordinator. Rule No. 1 is don’t top a tree. “Topping is the practice of removing large branches and tops of trees […] Read more


Cleaning, crown thinning, raising, and reduction are four main reasons for tree pruning.

Tips on the whys and hows of tree pruning

But less is often best as you can always prune more later

There are many reasons for pruning a tree, says provincial tree specialist Toso Bozic. Cleaning is the removal of dead, dying, diseased, crowded, weakly attached, and low-vigour branches from the crown of a tree. Crown thinning is the selective removal of branches to increase light penetration and air movement through the crown. Thinning opens the […] Read more

Dutch elm disease can cause leaves to wilt or droop, curl and become brown in early summer.

Majestic trees threatened by Dutch elm disease

Here are tips for spotting this devastating disease and preventing its spread

Alberta Dutch Elm Disease Awareness Week concluded on June 28. “American elms are planted extensively in Alberta and throughout the years have become the tree of choice for the Prairies with good reason,” said Janet Feddes-Calpas of the Society to Prevent Dutch Elm Disease (STOPDED) executive director. “These giants with their height and broad vase-shaped […] Read more