Emerald Ash Borer

The Emerald Ash Borer (EAB) was first found in Michigan in 2002 and has spread to twenty-two states including Colorado. It arrived in Boulder in 2013. The EAB is not native to the United States and has no natural predators to keep it in check. Another compounding factor is that White and Green Ash Trees have zero immunity to the EAB. It has wreaked havoc on the urban and native forests east of the Mississippi killing tens of millions trees.

Quick Facts from Colorado State University Extension Service

What does the EAB do?

  • Kills ash trees!
  • Larvae feed under the bark, eventually girdling the tree and cutting off nutrients.
  • Trees are killed within 2-4 years of first symptoms, even previously health trees.
  • Trees of all size can be attacked, from 1/2 inch saplings to the largest mature trees.
  • This insect is very difficult to detect because it is under the bark and the adults are only around from May to September.

Potential Impacts of Emerald Ash Borer to Colorado Communities

  • Kills ash trees!
  • Green and White Ash widely planted in Colorado over past 50 years.
  • Ash comprises 15%-80% of community trees depending on location.
  • Green ash is also naturalized along creeks and ditches throughout Eastern Colorado and parts of the Front Range. It has been found along Boulder Creek.
  • The City of Denver currently has a moratorium on planting ash trees in the public right-of-way.

Things To Think About Your Ash Trees

Residential and commercial property owners with ash trees need to ask themselves how much they value them. Tree value comes from the following:

  • A mature tree landscape adds between 5 to 10 percent to a property’s value. Denver’s real estate market has shot up substantially since the 1990s, so the value of mature trees in a yard equals the cost of a new automobile.
  • Mature Ash Trees provide shade and ambiance. Most homeowners will miss their trees when the hot, western Sun bears down on their home, and its colorful fall foliage.
  • Ash Borer treatment is less expensive than removal. Once a tree has died, it can no longer can be climbed. This means removal could involve the use of a crane which dramatically increases removal costs.
  • There are about 1.5 million Ash Trees in the Denver area. Once the EAB makes it presence known in Denver, it might be close to impossible to book an appointment with a tree service company. It is best to take the initiative and treat your ash trees now.

EAB Treatment Options

If a Denver property owner deems their Ash Trees valuable, then it’s time to start treatment. Ross Tree Company’s motto is “Integrity in Action.” We have three Qualified Supervisors (QS) who are certified by the Colorado Department of Agriculture on the correct application of tree insect control products. We are committed to only using only what is necessary to treat the trees of our customers and nothing more.

For young Ash Trees, we recommend a systematic bark spray. The Ross plant care specialist sprays the trunk up to five feet above the ground. The tree absorbs the spray product which protects young ash trees from ash borers. For large Ash Trees, we recommend trunk injections. The trunk injection equipment injects the EAB control products directly into the trunk. The tree’s vascular system absorbs the product and distributes it throughout the tree. An Emerald Ash Borer larva dies when it chews on the tree’s nutrient-conducting tissues. Trunk injections are cost effective because they last two years and are environmentally friendly.

Want to learn about your EAB treatment options? Click here to fill out a request service form or call 303-871-9121. We are at your service.

Our Trees look terrific!!! Your men were so nice and such hard workers. They did a great job and cleaned up nicely. It was a pleasure to have them here.
Mary & Dennis

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