PHOTO: Connie Mehmel, regional entomologist for the Okanogan-Wenatchee National Forest, points out signs of white pine blister rust in whitebark pine trees near Freezeout Ridge northeast of Winthrop in July 2008. Whitebark is a high-elevation tree species now under evaluation to determine whether it warrants protection under the Endangered Species Act. On the Okanogan-Wenatchee National Forest, it is being weakened by rust, and by mountain pine beetle.
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