FORT COLLINS, COLO. (AP) —The U.S. Forest Service plans to spray nearly 8,000 trees in northern Colorado to protect them against the spread of pine beetles and white pine blister rust. Crews in the Arapaho and Roosevelt national forests will spray more than 7,400 trees against pine beetles and about 250 trees against white pine blister rust. The trees are on campgrounds in the Canyon Lakes Ranger District.

Forest Service spokeswoman Reghan Cloudman tells The Coloradoan that although the pine beetle epidemic is waning, the beetles have moved to lower elevations because they've run out of food higher up.

The Forest Service expects to start spraying by April 28, but it'll have to wait until most of the snow melts. Workers can't spray pesticide into snow because it will get into the water.