The emerald ash borer (EAB), an invasive pest that has devastated ash tree populations across the U.S. and parts of Canada, has been confirmed in the City and County of Denver. This insect poses a significant threat to our urban forest, as one in every six trees in Denver is an ash tree.
The good news? There are steps you can take to protect your ash trees and help slow the spread of EAB:
What You Need to Do
Identify Your Ash Trees:
- Look for compound leaves with five to nine leaflets, opposite branching and diamond-patterned bark. Check out photos and tips to help you identify ash trees.
Inspect Your Trees:
- Signs of EAB infestation include:
- D-shaped exit holes in the bark
- Falling bark
- Wavy lines under the bark
- Increased woodpecker activity (especially Northern Flickers)
Take Action:
- If you have an ash tree, consult a licensed tree care professional to discuss treatment or removal and replacement. Proper treatments are 95% effective when applied by professionals.
- If removal is necessary, consider replacing your ash tree with a Denver Office of the City Forester-approved species.
Spread the Word:
- Share this information with neighbors, friends and colleagues to help slow the spread.
Supporting Our Urban Forest
Denver is offering free tree placements in some areas to help grow the urban forest. If you have space in the public right-of-way near your home, you may qualify.
Why It Matters
Trees are essential to our environment and quality of life. They produce oxygen, reduce smog, cool neighborhoods and increase property values. Taking action now will help preserve our urban forest for generations to come.
Check out our recent blog post to learn more about how to be a Smart Ash.