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Winter Pest and Disease Prevention for Trees

Even when trees appear dormant during winter, pests and diseases can still pose a threat. Many insects, fungi, and bacteria overwinter in tree bark, branches, or soil, waiting for spring to become active. December is the perfect time to take preventive measures to protect your trees and keep them healthy for the year ahead. A tree trunk in a forest has been gnawed at the base, likely by a beaver, with wood chips scattered on the ground around it. Leafless trees and dry grass are in the background.

A tree trunk in a forest has been gnawed at the base, likely by a beaver, with wood chips scattered on the ground around it. Leafless trees and dry grass are in the background.

1. Inspect and Remove Diseased Branches

Dead or diseased branches are a prime hiding spot for pests and fungal infections. During winter pruning:

Cut away dead, damaged, or diseased limbs.
Remove fallen leaves or debris around the tree base, which can harbor pathogens.
Dispose of infected material properly; do not compost it.

2. Monitor for Overwintering Pests

Some pests, like certain borers, aphids, or scale insects, spend winter under bark or in buds. Take these steps:

Look for signs of pest activity, such as egg masses or bark damage.
Apply dormant oils to smother eggs or overwintering insects on trees like fruit trees or maples.
Keep records of previous infestations to know where to focus treatment in early spring.

3. Protect Bark and Trunks

Cold weather and pests can create cracks in bark, making trees more vulnerable. Protect your trees by:

Wrapping trunks of young or thin-barked trees to prevent frost cracks.
Avoiding mechanical damage from tools or snow removal near the trunk.
Treating any existing wounds with appropriate care to prevent infection.

4. Maintain Tree Health for Natural Resistance

Healthy trees are less likely to suffer from pests and disease. Winter care includes:

Mulching around the base to insulate roots and conserve moisture.
Ensuring proper pruning to improve airflow and reduce disease risk.
Avoiding over-fertilization late in the season, which can stimulate vulnerable new growth.

5. Plan for Spring Treatments

Use the quiet winter months to plan preventive treatments for the upcoming growing season:

Fungicide applications for trees prone to fungal infections.
Targeted pest control based on last year’s infestations.
Consultation with a certified arborist for a customized tree health plan.

Trust Calgary’s Tree Care Experts

With years of hands-on experience, Prune It Up has become Calgary’s go-to team for professional tree pruning, preventative maintenance, and year-round arborist services. As part of Spruce It Up Garden Centre, we’re proud to offer complete tree and landscape care you can rely on all year long. 🌲 Contact Us Today! 📞 403-201-7525 🌐 www.spruceitupgardencentre.com Let our certified arborists help your trees stay strong, healthy, and beautiful—no matter how harsh Calgary’s winters get.