Smithsonian Report, 1941. — Craighead 



1. In A LODGEPOUE Pine Ghost Forest of Yosemite National Park, Calif. 

 These trees were all killed by the mountain pine beetle in an epidemic lasting only 4 years. 1915. 



ijL&mam^ 



2. Infestation of the Mountain Pine Beetle in lodgepole Pine. 

 Insect-killed trees show white in photograph. Bitterroot Xational Forest. 



