Emerald Ash Borer

The Emerald Ash Borer (EAB) is an exotic green beetle that was discovered in southeastern Michigan in the summer of 2002. It is spreading throughout the eastern United States and Canada and has destroyed millions of ash trees in these areas. The adult beetles nibble on ash foliage and cause little damage, however, the larvae feed on the inner bark of the ash trees, disrupting the tree’s ability to transport water and nutrients and causing the most significant damage. The beetle is an extremely slow mover and cannot fly fast or far, however, moves more quickly when aided by humans moving infested firewood or trees. All ash trees, with the exception of the mountain-ash, are susceptible to the EAB.

In September 2013, the Emerald Ash Borer was found in two trees in the northeast section of Boulder. Fortunately, none have been found in Greenwood Village or surrounding areas at this time. It is difficult to determine when EAB will make a presence in this area. We would like to encourage the public to become more aware of the EAB and what you can do if you have ash trees. The Colorado Department of Agriculture does provide general information that can be found at by clicking Ash Borer. If you have inspected your ash trees and suspect that your tree is infected with EAB, please contact the Colorado State University Extension office in Arapahoe County.

Arapahoe County Extension
5804 S. Datura Blvd.
Littleton, CO 80120
Phone: 303-730-1920

There are an estimated 2,000 ash trees within the public spaces of the Village. Staff is in the process of taking inventory and inspecting the ash trees to determine which trees will have proactive measures to be taken in the spring of 2014 for the EAB. If an ash tree is found to be infested with EAB, the tree will be removed and replaced with a different species of tree. Future tree planting by the Village will continue; however, ash trees will not be utilized. For any questions regarding the Village’s urban forest and EAB, please contact Kurt Nielsen, Public Works Supervisor, at 303.708.6158.

What you can do now:

  1. Identify the trees on your property and nearby spaces. Only ash trees are susceptible with the exception of the mountain-ash.
  2. If you have ash trees, become familiar with EAB signs and inspect your trees.
  3. Give them good care. Check them regularly and keep them watered and pruned in the dry months.
  4. Stay informed about the EAB through the CSU Extension Office and Colorado Department of Agriculture
  5. Don’t move firewood. Use it where you purchase it. Many insects and diseases are moved into new areas from transported wood.
  6. It is suggested to not plant new ash trees.