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Emerald Ash Borer

What is the Emerald Ash Borer?

The emerald ash borer (EAB), Agrilus planipennis, is an exotic insect responsible for the death or decline of tens of millions of ash trees in more than 20 states and Canada. Native to Asia, the beetle most likely arrived in the U.S. in the 1990s, hidden in wood-packing materials commonly used for shipping. The first detection occurred in southeastern Michigan in 2002. EAB already has cost communities billions of dollars to treat, remove and replace ash trees. Infestations are difficult to detect, as the larvae reside under the bark, the adults generally are only present from May through September, and ash trees may be infested for up to four years before there are visible signs of decline.

Potential Impacts in Colorado

In Colorado, EAB was detected for the first time in September 2013 in the City of Boulder. As a non-native insect, EAB has no native predators to keep populations in check, and threatens all true ash species (Fraxinus spp.). As a result, the beetle poses a serious threat to Colorado’s urban forests, where ash trees comprise an estimated 15 percent to 20 percent of all trees; the Denver Metro area alone has an estimated 1.45 million ash trees. Green and white ash, including ‘Autumn Purple’ ash and other varietals, have been widely planted in Colorado due to their fast growth, ability to tolerate urban growing conditions and high aesthetic value. Many of the state’s ash trees are located on private property and in parks and other community areas.

Edgewater currently has three-hundred forty-seven documented Ash trees in public right of way and private front yard areas. In order to properly plan for the treatment and removal of all Ash trees, the City of Edgewater has developed this formal plan to take proactive measures in sustaining the species throughout the City. This plan is based on a coordinated sharing of knowledge and experiences from those communities along the great lakes that were first attacked, scientists, federal and state regulators, along with municipal arborists and green industry members.

Edgewater’s Plan at a Glance

Inventory of Ash Trees with in Public Right-of-way (PROW)    Completed 2014

Initiate Plan Threat Level Green (EAB found in Colorado)        2015

                Prescribed removals of trees under 9” in PROW.

                Replant all removals in legal tree areas.

                Tag all Ash Trees larger than 9” with Yellow tape.

Initiate Plan Threat Level Yellow                                   EAB found within 15 miles of Edgewater

                Procure pricing for residential removals if resident intends to remove

                Offer discounted tree replacements for Ash trees removed

                Site inspections of PROW tees

Initiate Plan Threat Level Orange                                 EAB found within 5 miles of Edgewater

                Monthly inspection of Ash tree inventory in PROW

                Continue to offer resident removal rates

                Continue to offer discounted Ash tree replacements for removals

                Initiate 1st Treatment of all PROW Ash Trees

Initiate Plan Threat Level Red                                       EAB found in Edgewater

                Monthly inspection of Ash tree inventory in PROW

                Continue to offer resident removal rates

                Continue to offer discounted Ash tree replacements for removals

                Continue Treatment of all PROW Ash Trees

                Enforce removals of Ash trees with signs of EAB

To find more information in regards to the adopted plan please click here Emerald Ash Borer Plan Please feel free to call 720-763-3012 or email for additional questions.

2401 Sheridan Blvd, Edgewater, CO 80214 / Phone 303-235-8300 / Fax - 303-238-7192 /