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EAB Identification and Reporting | EAB Frequently Asked Questions | How Close Is EAB to You? | EAB Quick Guide
Emerald Ash Borer (EAB) was found in Boulder, CO, in September 2013. As a non-native insect, EAB lacks predators to keep it in check. EAB only attacks ash trees in the genus Fraxinus (so mountain ash are not susceptible).
Approximately 15% of the trees that make up Colorado's urban forest are ash. There are an estimated 98,000 in the city of Boulder alone. The Denver Metro area has an estimated 1.45 million ash trees. EAB is responsible for the death of millions of ash trees in the United States.
Help protect Colorado's ash trees! Don't move firewood, and consider chemical treatments to protect high-value ash trees within or near the EAB Quarantine area.
List of Businesses with an EAB Compliance Agreement - These companies that perform tree work in the Quarantine area and have formally agreed to abide by all of the applicable regulations imposed by the Emerald Ash Borer Quarantine. The following businesses can provide various services ranging from tree evaluations, pesticide treatment options, structural management/care, wood/mulch/chip resources, waste disposal as well as Emerald Ash Borer tree care management information.
It is possible that EAB could infest an ash tree for 3 or 4 years before visible signs of declineappear. If you think you have EAB in your ash trees, have any questions or concerns, or would like additional information, please contact the Colorado Department of Agriculture at 888-248-5535, email CAPS.firstname.lastname@example.org or visit the EAB Identification and Reporting page.
Use the links below to find a certified arborist to inspect your ash tree:
EAB only infests true ash trees (genus Fraxinus). Is your tree an ash tree?
There are many other insects and environmental factors that can damage ash trees in Colorado including cold injury, soil conditions, improper planting (such as planting too deeply or leaving the cage and/or burlap intact), and insects such as lilac/ash borer and ash bark beetle.
Infestation signs include:
Burn it where you buy it! The CAPS program is recommending that people use firewood from Colorado whenever possible, and to always ensure that their firewood is properly seasoned. In addition, when camping, people should try to buy firewood near their destination campground, to help prevent transporting pests elsewhere. Find local firewood dealers on the Colorado State Forest Service COWood website. Learn more about firewood best management practices.
Think diversity! When looking for replacement trees for ash, diversity matters. Look around your neighborhood and plant something you don't already see.
The Front Range Tree Recommendation List© was developed through the collaborative efforts of 12 individuals, three from each of the four participating professional groups: the American Society of Landscape Architects (ASLA), the Colorado Nursery & Greenhouse Association (CNGA), municipal arborists representing the Colorado Tree Coalition (CTC), and the Colorado State University (CSU) Extension. Based on the committee's collective education, knowledge, and experience, more than 250 trees or varieties were evaluated and rated, resulting in a single reference list for professionals to use and share with their customers or residents.
View and download the EAB Branch Sampling Protocol for Municipal Arborists
Nursery, Insect, Phytosanitary, Seed & Quarantines Program Coordinator
Phone: (303) 869 - 9070
Fax: (303) 466 - 2860
Email Laura Pottorff
CAPS Program Coordinator
Phone: (303) 869 - 9076
Email CAPS Program
The Colorado Emerald Ash Borer Response Team