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Emerald Ash Borer Alert

  • Published
  • Updated
  • by City Manager

Emerald Ash Borer Overview

Emerald Ash Borer ( EAB ) is an invasive insect that has killed more than 50 million Ash trees in 22 states since the initial discovery in Michigan in 2002. This insect is considered to be one of the most destructive, invasive species the United States has faced. A recent survey shows that Arvada has nearly 2,000 Ash trees growing on public property. The Arvada forestry division along with other metro forestry divisions is working on management plans to deal with this invasive insect.

News and Updates

The invasive tree pest Emerald Ash Borer (EAB) was confirmed in the City of Longmont. This detection is still within a quarantine area established to try and prevent the human-assisted spread of EAB, but represents the first confirmation of EAB anywhere in Colorado outside the City of Boulder. Read the July bulletin from the Colorado Department of Agriculture.

For more information on EAB detection and management going on in Boulder, visit Watch Your Ash, a multimedia project created by graduate students at the University of Colorado Boulder.

For more information on EAB please visit the following websites

Questions and Resources

  • What does the Emerald Ash Borer Look like?
    The insect is metallic and green. It is 1/2'"long and 1/8" wide.

How to Identify Emerald Ash Borer from EmeraldAshBorer.Info →  

  • Where has the beetle been found?
    The beetle was first identified in Michigan in 2002. Since then it has spread to Canada and 22 states. In September 2013 it was found in the city of Boulder and most recently was found in Longmont.

  • Has the beetle been found in Arvada?
    No. The beetle has not yet been found in the City of Arvada

  • What trees are at risk?
    All species of Ash trees 

Distinguishing Ash from other Common Trees (PDF) from EmeraldAshBorer.Info →


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