The Most Common Spring Tree Pests in Manitoba — And How to Handle Them
Trevor Soltys & Paul Kasper
Introduction
As temperatures rise, insects become active — and your trees are their first target. Some pests cause minor cosmetic damage, while others can weaken or kill a tree if ignored. Here are the most common spring pests in Manitoba and how to deal with them effectively.
🐜 1. Aphids
Tiny but destructive.
Signs:
- Sticky residue (honeydew)
- Curling leaves
- Ants climbing the tree
Aphids multiply fast, so early detection matters.
🐛 2. Forest Tent Caterpillars
A major defoliator in Manitoba.
Look for:
- Webbing
- Clusters of caterpillars
- Rapid leaf loss
Healthy trees usually recover, but repeated infestations weaken them.
🪲 3. Bronze Birch Borer
A serious threat to birch trees.
Symptoms:
- Thinning canopy
- D‑shaped exit holes
- Dieback starting at the top
Early intervention is critical.
🕷️ 4. Spider Mites
Common during warm, dry springs.
Signs:
- Fine webbing
- Speckled leaves
- Leaf discoloration
They often go unnoticed until damage is severe.
🌿 5. How to Protect Your Trees
- Keep trees well‑watered
- Avoid over‑fertilizing
- Remove infested branches
- Schedule a professional inspection
- Use targeted treatments when necessary
Healthy trees resist pests better.
Conclusion
Spring pests can spread quickly, but early detection keeps your trees strong and healthy. If you notice unusual leaf damage or insect activity, TreeSolve can help identify the problem and recommend the right treatment.
