Overview
Hemlock woolly adelgid is an invasive insect that feeds on the sap of hemlock trees. It forms distinctive white, woolly masses at the base of needles where it feeds. Heavy infestations weaken trees, causing needle drop, branch dieback, and eventual tree death over several years. This pest is a serious threat to native hemlock populations in many regions.
Signs of Infestation
- White, cottony masses on undersides of branches
- Needle yellowing and drop
- Thinning canopy and branch dieback
- Overall decline in tree health
- Presence of pest persists through winter
Treatment & Management
Systemic insecticides, horticultural oils, and insecticidal soaps can provide control. Treatment is most effective when applied early in the infestation. Protecting high-value trees through preventive treatments is often recommended in areas where the pest is present.
Why Choose Earth-Wise?
Our team has decades of experience treating hemlock woolly adelgid infestations throughout the Roaring Fork and Vail Valleys. We use integrated pest management approaches that are effective and environmentally responsible. Our ISA Certified Arborists can assess the infestation level and recommend the most appropriate treatment plan for your property.