Man's Effect on Colorado - imagesofthewild
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Pine trees with flakes, placed there to repel mountain pine beetles (Dendroctonus ponderosae). Taken in the Roosevelt National Forest, Colorado, USA.

Pinetreetreesflakesmountain pine beetlepine beetlebeetleDendroctonus ponderosaeRoosevelt National ForestColoradoUSApestmanagementrnfpinebeetleflakes011ash300