Emerald Ash Borer (EAB) is a metallic green beetle that feeds on ash tree species. The beetle originated from Asia and is thought to have been introduced to North America in the 1990s on solid wood packing material.
In the U.S., EAB is a federally quarantined, invasive tree pest responsible for the death or decline of more than 100 million ash trees to date.
As of January 2021, EAB has been found across much of the U.S. EAB in the U.S. (PDF) and as of September 2013, EAB has been found in Colorado. CSU Extension EAB Resources