Edmonton and Red Deer currently have a severe problem with poplar borer in urban Swedish columnar aspens.  Calgary also has an emerging problem that is expected to get worse in the next few years.

Poplar borer infestation can be a major problem for Swedish columnar aspen trees, but with proper monitoring and treatment, it doesn’t have to be. It is important to be aware of the signs of poplar borer infestation and to take steps to prevent and treat the problem.

In the absence of beetles, the two main signs of poplar borer infestation are weeping holes along the main trunk and larger limbs, and sawdust at the base of the tree.  Sawdust is a sure sign that the beetles are actively tunneling into the tree and should be taken as an indication to take action.  Adult beetles are around 1/2 inch long and have a metallic green or bluish-black coloration. They can often be seen flying around the tree or on the trunk in summer.  The larvae can remain in the trunk for up to three years.

Once a poplar borer infestation has been identified, an important first step is to use insecticides to kill the beetles.  We use products that only target insect pests and are not harmful to the trees.

Another important step in preventing poplar borer infestations is to maintain the overall health of the tree. This includes providing the tree with adequate water, fertilizing as needed, and pruning away any dead or diseased branches. A healthy tree will be less susceptible to infestation and will be better able to recover from any damage caused by the beetles.

It is important to be proactive in preventing and treating poplar borer infestations in Swedish columnar aspen trees. By monitoring for the presence of bore holes and sawdust, removing infested branches and twigs, using insecticides, and maintaining the overall health of the tree, you can help to protect these beautiful trees from the devastating effects of poplar borer infestation.