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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). EAB is responsible for the death of millions of ash trees in the Midwest. 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.
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.
It is possible that EAB could infest an ash tree for 3 or 4 years before visible signs of decline of the tree. If an ash tree is experiencing die back or looking unhealthy, residents are encouraged to have it examined by a professional tree company, contact CDA, their local Extension office or their city or county forestry office.
Infestation signs include:
If you think you have EAB in your ash trees, or if you 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 use the EAB identification and reporting form.
EAB Industry Contact List for Boulder County Quarantine Area - List of companies that do work in Boulder County 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 managment/care, wood/mulch/chip resources, waste disposal as well as Emerald Ash Borer tree care management information.
Nursery, Insect, Phytosanitary, Seed & Quarantines Program Coordinator
Phone: (303) 869 - 9070
Fax: (303) 466 - 2860
Email: Email Laura Potorff
CAPS Program Coordinator
Phone: (303) 869 - 9076
Email: Email CAPS Program