What Fort Collins, CO Residents Need to Know About the Emerald Ash Borer (EAB)

  • EAB is not native to North America, so there are no natural predators to control their populations.
  • As of today, EAB is considered the most destructive tree pest in the United States.
  • All true Ash trees are susceptible to infestation of Emerald Ash Borer.

Do I Need to Treat My Ash Trees Now?

Emerald Ash Borer has not been officially detected in Fort Collins; however EAB could be here waiting for discovery as these destructive pests are usually present for 3-5 years before detection.  City of Fort Collins officials have started removing some Ash trees in preparation and believe it is just a matter of time before they invade Larimer County.

Once EAB is established in our area, all untreated Ash trees will eventually die.  It is in your best interest as a Northern Colorado home owner to decide what course of action to take regarding your valuable plantings.We offer several preventative treatments should you decide to invest in your Ash trees.

If you are unsure whether or not you have Ash trees on your property, or if you would like a recommendation on whether or not your Ash tree is a good candidate for treatment, please let us know and we will have one of our qualified Arborists assess your trees.

Get Updates about the migratory patterns of the Emerald Ash Borer in Colorado by downloading the EAB/Ash Tree ID App

What are My Options to Combat EAB?

We currently offer three treatment options:

  1. Soil Drench – Systemic insecticide is applied at the base of the tree in the Spring. This is performed once per season for year-long control.
  1. Trunk Spray – Systemic insecticide is sprayed on the lower trunk of the tree in the Spring. This is also performed once per season for year-long control
  1. Trunk Injection – Systemic insecticide is injected into the tree trunk in the Spring. This protects you Ash trees for two years with just one application.


Candidates for Removal and Replacement include:

  • Ash trees nearing the end of their lifecycles
  • Trees exhibiting symptoms of infestation/disease
  • Hazardous trees, stressed trees, and trees in the wrong location

If you are not sure what is best for your Ash trees let our certified local arborists provide you with an expert evaluation for your specific landscape needs.


I Thought I Was Already Treating for Ash Borers?

Many Fort Collins residents are currently treating their trees and shrubs for the Ash/Lilac Borer; this is NOT the same treatment used to control Emerald Ash Borer.

Ash/Lilac Borers are treated with an insecticidal trunk spray. EAB can only be prevented with systemic insecticides that move to all parts of the plant.

If you have ash trees or lilacs in your landscape, especially young or new plantings, this is one of the most destructive insects you currently need to watch for.

Let our certified arborists evaluate whether or not your landscape would benefit from our customized preventative Ash/Lilac Borer control plan.


Don’t wait until it’s too late.  Get your free evaluation from a local, certified arborist today.