Emerald Ash Borer Treatment

Fielding Tree Care Provides Prevention and Treatment options for Emerald Ash Borer (EAB) Beetle Infestation.

Treatment Services

The Best Emerald Ash Borer Beetle Treatment and Prevention In Denver

As the phrase goes, the best time to plant a tree was 20 years ago. The second best time is now. The same can be said for ash treatment. If you are not already treating your trees, then now is the time! Chemical insecticides are available to effectively treat landscape ash trees threatened by EAB. It is best to begin using insecticides while ash trees are still relatively healthy. If insecticide treatment begins after the first signs of infestation, such as canopy thinning, it can stop additional damage, but it will not reverse any damage that has already been done.

Early detection and rapid treatment is the best approach to boosting your tree’s survival chances. Our preventative Emerald Ash Borer treatment lasts for two years.

Pest Alert

Ash Trees Across Colorado Are At Significant Risk From The EAB

The Emerald Ash Borer beetle has caused devastation to ash trees in many states, and Colorado is no exception. The stress from consecutive years of off-season freezes and winter drought make ash trees more susceptible to EAB infestation, so it is important to take preventative measures now. We are confident that you can trust our certified arborists with your emerald ash borer treatment.

Image credit to Emerald Ash Borer of Wisconsin. Visit their Signs and Symptoms of EAB page for more info.

Disaster in Slow Motion

Since Their Arrival in September of 2013, EAB Have Been Infesting and Killing Ash Trees in Colorado

It’s probably put best by Boulder County’s and Denver Park’s and Recreation’s (respective) initiatives to combat Emerald Ash Borer infestations: You need to “watch your ash!” and “Be a Smart Ash.” This is an issue that, without the community’s help, has the potential to wipe out our prized North American Ash species. In addition to visiting these resources, make sure to do a web search in your area for news surrounding “EAB” or “Emerald Ash Borer” to make sure that you have all the information you need to protect your landscape.

If you live in our south Denver, Colorado service area, please reach out to us for a free consultation so that a professional arborist can assess your property as soon as possible.

Now Is The Time To Protect Your Ash Trees.

Book your free consultation with one of our ISA-certified arborists.Take the first step to protect your ash tree today!


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Indications, Effects and Treatment for Emerald Ash Borer (EAB) in Colorado

Indications, Effects and Treatment for Emerald Ash Borer (EAB) in Colorado

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Denver’s scenic landscapes face a looming threat as the Emerald Ash Borer (EAB) beetle continues its devastating journey, targeting ash trees throughout the city. For homeowners, recognizing the telltale signs and taking proactive measures for Emerald Ash Borer treatment is essential to shield their valuable trees.

EAB Essential Information

The EAB, a non-native and invasive wood-boring insect, poses a significant menace to ash trees in Denver. Distinguished by its metallic green or reddish appearance, the adult beetles lay eggs that hatch into larvae, inflicting considerable damage by interrupting water and nutrient flow beneath the tree’s bark. As the most destructive pest in the U.S., the EAB can wipe out various North American ash tree species, including the well-liked autumn purple ash in the South Denver and Littleton areas.

EAB Origins and Spread

Denver confronts the swift propagation of EAB, driven by favorable weather conditions and the insect’s capacity to travel. Infestations often go unnoticed, underscoring the importance of preventive Emerald Ash Borer treatment. Human activities, particularly the movement of ash firewood, play a significant role in the long-distance dissemination of EAB. The life cycle of EAB, from egg-laying to larvae feeding, further accelerates the infestation.

Indigenous to China, Mongolia, North Korea, South Korea, Japan, Taiwan, and the Russian Far East, the emerald ash borer beetle (EAB) remained unfamiliar in North America until its identification in southeast Michigan in 2002. Presently, EAB infestations have been observed in 36 states and the District of Columbia, including Alabama, Arkansas, Colorado, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia, and Wisconsin. Moreover, addressing the emergence of EAB in the United States requires vigilant monitoring and timely implementation of effective Emerald Ash Borer treatment strategies.

Warning Signs of EAB Infestation

Identifying the signs of EAB infestation is crucial for early intervention. Keep an eye out for adult beetles, a thinning canopy, D-shaped exit holes in bark, broken branches, bark splintering, heightened woodpecker activity, and the emergence of epicormic shoots. Detecting these signs early allows for timely Emerald Ash Borer treatment, enhancing the likelihood of saving the tree.

State of Concern

EAB has presented challenges to the Denver Metro area since 2013, with an estimated 1.45 million ash trees at risk. Despite quarantine efforts, EAB has spread to various cities, prompting proactive management plans.

Local Colorado agencies like the Colorado Department of Agriculture and Colorado State University Extension express serious apprehension regarding the exponential expansion of EAB populations. Denver’s history with EAB in nearby cities like Littleton indicates a delay between infestation and diagnosis, providing the pest with an opportunity to spread. Human activity, especially the movement of infested ash trees, logs, or firewood, significantly exacerbates the problem.

Emerald Ash Borer Treatment

Effective Emerald Ash Borer treatment involves a varied approach, commencing with preventive measures. Chemical insecticides, such as systemic trunk injections, soil injections, lower trunk sprays, and protective cover sprays, offer different levels of protection. Timing is of the essence, and applying Emerald Ash Borer treatment during the spring, targeting the adult beetle emergence, is ideal. Additionally, adhering to proper tree care practices, including watering, mulching, trimming, and fertilizing, contributes to the tree’s overall health and resilience.

Investment Considerations

While investing in Emerald Ash Borer treatment and prevention, it’s crucial to consider factors such as tree size, location, and health. Comparing the costs of insecticide treatment to potential removal costs demonstrates that prevention is a more economical choice. A study on insecticide options even underscores the economic advantages of treating trees before infestation.

At Fielding Tree Care, we provide free, onsite consultations with a certified arborist who can give you honest prevention and treatment options.


As Denver contends with the relentless spread of the Emerald Ash Borer, homeowners must take proactive steps to safeguard their ash trees. Early detection, prompt Emerald Ash Borer treatment, and adopting proper tree care practices are pivotal to preserving Denver’s urban forests. Stay informed, act promptly, and contribute to the collective effort to mitigate the impact of EAB on our city’s cherished trees.

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