Emerald Ash Borer Survey
Emerald ash borer (EAB) is a very serious pest of ash trees. It was found in Boulder, Colorado in the fall of 2013. Colorado Department of Agriculture staff and local forestry staff are inspecting ash trees to determine the extent of the infestation.
What does EAB do?
- Kills ash trees!
- Larvae feed under the bark, eventually girdling the tree and cutting off nutrients.
- Ash trees are killed within 2-4 years of first symptoms, even previously healthy trees.
- Ash trees of all size can be attached, from 1/2 inch saplings to largest mature trees.
- This insect is very difficult to detect because it is under the bark and the adults are only around from May to September.
How did EAB get here?
Infestations result from movement of infested ash trees and wood. The insect does not fly far from its own. Some of the items it moves on or in:
- Packing material/industrial wood material
- Live plant material (nursery stock, etc.)
- Ash wood such as logs, branches, chips, etc.
What is being done about this new pest?
The goal is determine the extent of the infestation through a visual survey and branch sampling of ash trees. Then management strategies will be applied to control and prevent the spread of this very damaging pest.
For more information visit the following websites:
Contact the Colorado Department of Agriculture at 1-888-248-5535 or email