Don Hardin’s hillside was largely cleared of trees killed by the mountain pine beetle. Some of the trees have died in just a few weeks with Ips beetles munching their tops and mountain pine beetles coming through their bark in large visible holes. …Across Colorado, mountain pine beetles also are on the rise in Douglas, Jefferson and Gilpin counties, among other areas, said Dan West, forest entomologist with the State Forest Service. The agency’s annual aerial survey shows the number of infected acres increasing from less than 2,000 acres in 2021 to nearly 6,000 acres last year. …To combat the beetle, the State Forest Service is putting small packets on trees to send the message to mountain pine beetles to seek a home elsewhere, West said. The message will be sent through a synthetic replication of beetle pheromones that sends a “no-vacancy signal” to adult pine beetles looking for a healthy tree to infest.