Overview
The Emerald Ash Borer (EAB) is a metallic green beetle native to Asia that was introduced to North America in the 1990s. This invasive pest has killed hundreds of millions of ash trees and poses a severe threat to Colorado's ash tree population.
Identification
Adult beetles are 7-14 mm long with a distinctive metallic emerald green color. The most diagnostic sign is the "D"-shaped exit hole left in the bark, approximately 3-4mm wide.
Signs of Infestation
- D-shaped exit holes in bark (3-4mm diameter)
- Thinning or yellowing foliage in upper canopy
- Dying branches and branch dieback
- Vertical bark splits
- Epicormic sprouting (shoots growing from trunk)
- Increased woodpecker activity
- S-shaped larval galleries under bark
Damage & Impact
EAB larvae feed on the phloem and cambium tissues under the bark, disrupting the tree's ability to transport water and nutrients. Infested trees typically die within 2-4 years of initial attack.
Treatment & Prevention
Preventative Treatment
Systemic insecticide treatments can protect healthy ash trees from EAB attack. Treatment must begin before infestation occurs and continue on a regular schedule.
Management Options
- Trunk injection of systemic insecticides (most effective)
- Soil drenching treatments
- Removal of heavily infested trees
- Quarantine procedures to prevent spread
Why Choose Earth-Wise?
Earth-Wise offers comprehensive EAB management programs including monitoring, preventative treatments, and removal services. Our certified arborists stay current on the latest EAB research and treatment protocols. Early intervention is key – contact us today to protect your ash trees.