Emerald Ash Borer

Upcoming Workshops for Tree Care Professionals

Where has EAB been found? 8/14/2014

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Managing Emerald Ash Borer: Decision Guide

Ash Management Zones (How close are you to EAB?)

Emerald Ash Borer (EAB) was found in Boulder, CO, in September 2013. As a non-native insect, EAB lacks predators to keep it in check. EAB only attacks ash trees, and is responsible for the death of millions of ash trees in the midwest. Help protect Colorado's ash trees! Treatment is recommended for property owners within 5 miles of areas known to be infested.

Effective 11/12/2013, an emergency quarantine was issued to protect Colorado ash trees. See links below regarding the quarantine.

Colorado has many ash in the urban forest (we estimate about 15% of trees are ash). Ash trees are popular in Colorado with an estimated 98,000 in the city of Boulder alone; the Denver Metro area has an estimated 1.45 million ash trees.
It is possible that EAB could infest an ash tree for 3 or 4 years before visible signs of decline of the tree. If an ash tree is experiencing die back or looking unhealthy, residents are encouraged to have it examined by a professional tree company, contact CDA, or their city or county forestry office. Infestation signs include:
  • Sparse leaves or branches in the upper part of the tree
  • D-shaped exit holes about 1/8 inch wide
  • New sprouts on the lower trunk or lower branches
  • Vertical splits in the bark
  • Winding S-shaped tunnels under the bark
  • Increased woodpecker activity

If you think you have EAB in your ash trees, or if you have any questions or concerns, or would like additional information, please contact the Colorado Department of Agriculture at 888-248-5535 or email CAPS.program@state.co.us.

Colorado State University, Questions and Answers about EAB

How to Manage EAB

How Can You Help?

  • Burn it where you buy it the CAPS program is recommending that people use firewood from Colorado whenever possible, and to always ensure that their firewood is properly seasoned. In addition, when camping, people should try to buy firewood near their destination campground, to help prevent transporting pests elsewhere.

 Colorado Emerald Ash Borer Response Team

Assessing your ash tree for Emerald Ash Borer -- New Video!!



Check out the lifecycle of EAB -- Great Video!!



Check out an EAB Bark Peeling Instructional Video!




The Colorado Tree Coalition Takes the Ice Bucket Challenge!



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