Home / Environment / Fuzzy Forest Invaders: Caterpillar Outbreak Spreads
Fuzzy Forest Invaders: Caterpillar Outbreak Spreads
31 May
Summary
- Forest tent caterpillar populations surge cyclically every decade.
- Caterpillars consume tree leaves, but healthy trees can usually recover.
- Non-pesticide control includes manual removal or biological sprays like BTK.
Forest tent caterpillar populations are experiencing a notable surge across several Alberta municipalities, including Mahogany, Red Deer, Olds, and Devon. Entomologists explain that these native insects undergo cyclical outbreaks approximately every decade, driven by factors such as weather and predator-prey dynamics. The caterpillars' primary impact is defoliation, as they consume tree leaves, and can even damage buds in early spring.
While a healthy tree can typically recover from a single season of defoliation, prolonged infestations can weaken it, making it susceptible to other pests and diseases. For residents concerned about the caterpillars, manual removal or the use of biological pesticides like Bacillus thuringiensis kurstaki (BTK) are recommended alternatives to chemical treatments. Tree owners are advised to remove egg clusters in the fall to prevent future hatches.
These outbreaks, recorded in Canada since the 1930s, play a role in the ecosystem by serving as a food source for other animals and their feces acting as fertilizer. However, severe infestations can lead to tree decline, prompting a need for improved tree care and management strategies to ensure long-term health.
