What You Can Do
If You Have an Ash Tree
If you have an ash tree you need to evaluate and plan for their protection or removal. Your choice of actions and urgency will depend on factors that include the current health of the tree, the costs of treatment and removal, and how close you are to known infestations.
- Planting a diverse urban forest makes it more resistant to pests.
- Once a tree becomes infested it will die unless you are able to treat it soon after it becomes infested.
Within 10-15 miles of known infestation
If you have an ash tree on your property and you are within 10-15 miles of the known infestations you need to decide if you will remove or treat your ash trees.
Treatment needs to occur in spring to early summer. If you hire a contractor, they need to be licensed as a Commercial Applicator by the Colorado Department of Agriculture.
More than 15 miles of known location
If you have an ash tree on your property and you are more than 15 miles of the known infestations you should:
- Monitor your trees and look for thinning in the upper canopy
- Water regularly including winter and fall watering
- You may want to plan on their eventual replacement with a different type of tree
- If there are no signs of decline it is not necessary to treat unless there are other insect pests affecting your ash trees
CSU Extension Fact sheet - Insecticides Used to Control Emerald Ash Borer on Residential Shade Trees – 5.626
Don’t Move It
Because EAB can survive in ash wood, it is best if you do not move it unless you take precautions.
Colorado is working with USDA APHIS to develop biological control agents that may control EAB.