Emerald ash borer detected in Lyons

New detection is still within quarantine area
No ash wood may be removed from the quarantine area. (Photo: Colo. Dept. of Agriculture)

Emerald ash borer’s slow march through Boulder County continues. State officials announced in late March that the invasive pest was identified in an ash tree on private land in Lyons.

The new detection is still within the quarantine area, but is the fourth community outside Boulder where EAB has been identified. Initially identified in Boulder in 2013, EAB spread to Longmont and Gunbarrel in 2016. It was detected in Lafayette last summer.

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It’s not clear if the new identification is the result of accidental human transport. The Colorado EAB Response Team notes that EAB can expand its reach by half a mile every year. Lyons is less than 12 miles from Longmont and about 15 miles from Boulder.

Keith Wood, manager of urban and community forestry for the Colorado State Forest Service, encourages landscape professionals in Boulder County to continue to be diligent “in not only looking for this pest on ash trees in landscapes they maintain, but to be sure and be aware about wood movement within and outside of the Boulder County quarantine area.”

Under the quarantine, any untreated ash wood and hardwood firewood may not be moved out of the quarantine zone.

“Natural spread of this pest is inevitable, but we can all do our part in the green industry to follow the rules of the quarantine and restrict wood movement,” Wood said in an email.

The Colorado Department of Agriculture has resources on its website to help identify ash trees and control EAB, including a mobile app available for Apple and Android devices that walks users through identifying ash trees.

(Photo: Colorado Department of Agriculture)

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