DENVER (AP) – The Colorado State Forest Service says an insect that kills ash trees hasn’t spread outside the city of Boulder, but a disease that attacks black walnut trees is advancing.

In its annual forest health report released Wednesday, the agency said the emerald ash borer is spreading within Boulder, but monitoring conducted last year didn’t find the insect in other towns.

Areas where monitoring was conducted include metro Denver, Erie, Golden, Greeley, Lone Tree and Longmont.

The Forest Service said thousand cankers disease was found in black walnut trees in cities from Fort Collins to Canon City. It was also detected in Fort Morgan, farther east than previous locations in the state.

The walnut twig beetle, which carries the disease, was found in Kiowa County near the Kansas border.

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