BOULDER, Colo. (AP) — The Colorado State Forest Service is trying to determine the best way to stop a tree killer called the emerald ash borer.

The service said Monday that it will be working with the city and county of Boulder to place more than 120 traps this year.

A trap to capture Emerald Ash Borers (credit: Colorado State Forest Service)

A trap to capture Emerald Ash Borers (credit: Colorado State Forest Service)

The test will help in researching the most effective trapping methods for the nonnative pest and in detecting whether it is present outside the city of Boulder, the only place it has been detected so far in Colorado. Drivers this spring may notice green or purple traps in trees.

(credit: Colorado State Forest Service)

(credit: Colorado State Forest Service)

Dan West, a forest service entomologist, says borers, which have killed tens of millions of ash trees in the United States, can be present for up to four years before trees show visible decline.

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