The emerald ash borer , a tiny yet destructive invasive beetle, has been confirmed in Aurora. That's prompting officials in the Colorado city to remove or treat infected trees and encourage residents to monitor their own.

CBS

The pest has already damaged trees near Quincy Reservoir, where city crews have removed several dead ash trees. Officials say while not all of Aurora's estimated 110,000 ash trees are infected, many are vulnerable -- and about 90% are located on private property.

"This is the best time to start monitoring this pest and start treatments if you really want to save the ash trees in your yard," said Gopal Ghimire, Aurora's Forestry Superintendent.

Ghimire said residents should look for D-shaped holes in the bark -- a sign of emerald ash borer activity. In front of

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