EAB: What You Can Do
An estimated 15 percent or more of all urban and community trees in Colorado are ash species susceptible to being killed by EAB.
A majority of these trees are on private land.
The most important action homeowners all over Colorado can take now is to determine if they have ash trees. Other actions homeowners can take to help mitigate EAB are outlined below.
- Sparse leaves or branches in the upper part of the tree
- Vertical splits in bark possibly showing S-shaped galleries underneath
- Increased woodpecker activity
- Miniature leaves at the tips of branches late in the summer
Ash trees have been widely planted in Colorado, but because EAB is always fatal to untreated ash trees, avoid planting any true ash species (genus Fraxinus). Instead, consider the following recommendations:
- Focus on tree and landscape-plant diversity. No one tree species should comprise more than 10 percent of the planted trees growing in any urban or community setting.
- “Plant ahead” and get new trees in the ground that can someday replace ash trees lost to EAB and the shade and other benefits they provided.
An ash tree replacement tool, which includes a list of trees suitable for ash replacement, is available on the Colorado Tree Coalition website.
- Monitoring trees for the presence of EAB
- Removing and/or replacing ash trees
- Planting new trees preemptively in an effort to get them established before the arrival of EAB