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Emerald Ash Borer Alert

  • Published
  • Updated
  • by City Manager

Emerald Ash Borer ( EAB ) is an invasive insect that has killed more than 50 million Ash trees in 30 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

  • July 31, 2017 - “While we can tell you definitively where EAB is known to be in Colorado, and where treatments of high-value, healthy ash are now necessary, it’s impossible to tell you where EAB isn’t located,” said Laura Pottorff, plant-pest quarantine manager for the Colorado Department of Agriculture and lead member of the Colorado Emerald Ash Borer Response Team. 
      Download Emerald Ash Borer: To Treat, or Not to Treat?

Questions and Resources


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.

General Information

For more information on EAB please visit the following websites


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


 Visit 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 30 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 Trees (PDF) 



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