Emerald Ash Borer
Treatment and Prevention
The Emerald Ash Borer is an invasive beetle that is destroying ash trees across Colorado.
Identification
Early identification of Emerald Ash Borer (EAB) is critical for effective management. Look for signs such as thinning canopy, D-shaped exit holes (about 1/8 inch wide) on the bark, S-shaped tunnels (galleries) beneath the bark (if peeled back), and increased woodpecker activity as they feed on larvae. Stressed ash trees may also produce new shoots (epicormic sprouts) from the trunk or base, or exhibit vertical bark splitting.
Treatment
Treatment for EAB typically involves the application of systemic insecticides, often delivered via trunk injections. These treatments move throughout the tree to kill the feeding larvae. The effectiveness of treatment depends on the tree's health and the severity of the infestation, with healthy trees showing early symptoms having the best chance of recovery. Treatments usually need to be repeated every 1-3 years our a certified arborists, like for continued protection.
Prevention
The most effective way to prevent EAB infestation is through proactive measures. This includes choosing healthy ash trees, proper planting and care to minimize stress, and avoiding the movement of firewood, which is a primary way EAB spreads to new areas. In areas where EAB is present or imminent, preventative insecticide treatments applied to healthy ash trees can provide long-term protection, making these valuable trees less susceptible to attack.
Emerald Ash Borer Managemant
Arbor Doctor offers industry-approved treatments that can save your tree—if caught early.
Don’t wait until it’s too late.
Thanks for trusting Arbor Doctor Tree Service with your tree health!
Why Work With Us
We Treat Trees Like Family
We don’t just trim and remove trees—we care for them like they’re part of the family. Every decision we make comes from a place of respect for nature, long-term health, and doing what’s right.
Firefighter & Veteran Owned – Service Is in Our Roots
As a firefighter and veteran-owned business, we’ve spent our lives serving the community. Now we bring that same dedication and integrity to caring for the trees that make Colorado beautiful.
Certified Arborists – Tree Work Backed by Science & Skill
We’re not just a guy with a chainsaw. We’re ISA Certified Arborists trained to diagnose, preserve, and treat trees with expert care. Think of us as your neighborhood tree doctors—always on call.
Locally Owned with Deep Colorado Roots
We live here. We work here. And we know Denver’s trees like no one else. As a locally owned business, we’re proud to serve our neighbors with the highest quality tree care in the region.
