Municipal Mini: Forest Tent Caterpillars In Olds

You may have noticed an increase in caterpillars around Town recently, especially on poplar, aspen, ash, and other deciduous trees. Alberta is currently experiencing a natural forest tent caterpillar population cycle, which typically occurs approximately every 10 years. These outbreaks are most noticeable during May and June.

While the defoliation can look dramatic, healthy trees usually recover without long-term damage. Forest tent caterpillars are considered a natural part of our local ecosystem and are generally harmless to people and pets. They also serve as a food source for birds and other wildlife.

While mostly harmless, the small hairs on the caterpillars may cause skin irritation or mild allergic reactions in some individuals if handled, particularly for those with sensitivities. As always, it is best to avoid handling them directly.

At this time, the Town will not be undertaking large-scale treatment measures. These population cycles are temporary and typically resolve naturally over time.

We understand they can certainly be a nuisance and we appreciate everyone’s patience as nature does its thing this spring.

For more information on forest tent caterpillars, visit Natural Resources Canada.