Emerald Ash Borer

Asked July 8, 2017, 10:57 AM EDT

What should we be doing now to protect our Ash trees from the Emerald Ash Borer?

Larimer County Colorado

1 Response


If you're residing in Larimer County, we are not recommending treatment at this time. The insect has been confirmed as far north as Longmont, but still only in Boulder County.

However, you can make a plan for your ash trees and decide what you will do once treatment becomes necessary. Treatment may not be a feasible option for all trees. You will need to carefully evaluate and assess your tree. Is it old and producing shade for you house? Does it have any injury from storms, lawnmowers? Was it planted properly? Does it have previous insect injury from lilac ash borer?

In general, many cities are not treating trees less than 12-14" in diameter at chest height. Instead, they are removing and replacing--also an option for you. You can "shadow plant" a new tree species near the existing ash, with the intent to remove the ash in a few years.

For the latest information on EAB, visit eabcolorado.com.