Emerald ash borer (Agrilus planipennis; EAB) is an insect native to Asia. It was introduced into North America sometime during the 1990s, probably via ash wood pallets or wood packing material.
Since its initial discovery in southeastern Michigan in 2002, this insect has killed millions of ash trees (Fraxinus spp.) throughout the central and northeastern United States and Canada. EAB is now considered the most destructive tree insect pest ever to be introduced into North America.
An infestation was first detected in Colorado in the City of Boulder in September 2013. Approximately 15 percent of the trees in Colorado’s urban forests are ash, making this insect a major threat to urban forests statewide.
Carrie Tomlinson
CSFS Urban & Community Forestry Manager
[email protected]
Dan West
CSFS Entomologist
[email protected]
In June 2023, experts from Colorado State University confirmed the presence of emerald ash borer (EAB) in two new towns in Colorado: Carbondale and Littleton.
Experts from Colorado State University Extension confirmed the presence of emerald ash borer (EAB) in the City of Thornton in June 2022. This is the first confirmation of EAB in a Colorado city east of I-25.
The Town of Erie is the latest community on the Front Range to confirm the presence of emerald ash borer – an invasive, highly destructive tree pest.
EAB is on the move along the Front Range, and with Emerald Ash Borer Awareness Week taking place this week, partners with the Colorado Emerald Ash Borer Response Team are encouraging residents to prepare for EAB and ‘plant ahead’ for the inevitable.
BROOMFIELD, Colo. – With a new spring season, trees are emerging from their winter dormancy period across Colorado to bring life, color and vibrancy to our urban forests.
FORT COLLINS, Colo. – When considering a tree care professional to help manage your ash trees for emerald ash borer (EAB), here are some things for homeowners to consider.
