The University of Colorado has cut down 16 ash trees on its east campus in Boulder after confirming that the trees were infested with emerald ash borers, officials say.
The trees were taken to the city forestry yards, where officials are looking for telltale signs of the destructive insects.
Untreated ash trees and their parts in Boulder County have been under quarantine since Nov. 12, when the Colorado Department of Agriculture confirmed that an ash tree inspected by city of Boulder forester Kathleen Alexander on Sept. 23 was infested.
The city has cut down six trees because of ash borers — which officials say have killed more than 50 million ash trees in 21 U.S. states since 2002. CU officials last month found 21 trees on campus that showed symptoms of infestation, university spokesman Mark Miller said.
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