The U.S. Forest Service says an outbreak of spruce beetles is spreading at an accelerating rate across hundreds of square miles of new forest in Colorado.
Meanwhile, a massive outbreak of the similar mountain pine beetle continues to slow down across Wyoming, Colorado and the Black Hills of South Dakota and Wyoming.
Every year, the Forest Service conducts an aerial survey of forests in Colorado, Wyoming and South Dakota. The 2013 survey shows spruce beetles spreading to ever-larger expanses of new forest in Colorado for a fifth consecutive year.
Spruce beetles infested 338 square miles of previously unaffected Colorado forest last year. That's up from about 95 square miles in 2008.
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