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EAB Identification and Reporting | EAB Frequently Asked Questions | Options for Safe Handling of Ash-Tree
EAB Quick Guide | Diagnosing EAB and Other Ash Tree Damage
Emerald Ash Borer Detected in Larimer County near Berthoud
Emerald Ash Borer Detected in Broomfield
Emerald Ash Borer Detected in Superior
New app for ash tree ID
Watch your Ash!
Watch Your Ash is a multimedia project from graduate students at the University of Colorado providing an excellent overview of EAB detection and management in Boulder.
Managing Emerald Ash Borer: Decision 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.
It is possible that EAB could infest an ash tree for 3 or 4 years before visible signs of decline appear. 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.
The Colorado Emerald Ash Borer Response Team