Posted Tuesday, May 22, 2012 --- 6:30 a.m.

MADISON, Wis. (AP) -- Federal officials are reminding campers in the Chequamegon-Nicolet National Forest to use local firewood to ensure a tree-eating beetle doesn't spread.

The emerald ash borer, an Asian beetle that kills ash trees, travels by way of infested firewood or nursery stock transported from one location to another.

Forest officials are reminding campers to use only firewood gathered within the forest, purchased from a vendor within 25 miles of the forest or certified by the state Department of Agriculture, Trade and Consumer Protection.

Copyright 2012. The Associated Press.