136 MISC. PUBLICATION 273, U.S. DEPT. OF AGRICULTURE 



(JfJf, Jf.9, 78) is very destructive to pines in the high mountains of 

 California, Oregon, Washington, western Nevada, Idaho, western 

 Montana, northwestern Wyoming, and British Columbia. In many 

 places it has all but wiped out thousands of acres of lodgepole and 

 western white pine (fig. 59), taken a heavy toll of valuable sugar 

 pine, and attacked and killed ponderosa pine, white-bark pine, 

 and many other species of pine within its range. Even fir, spruce, 

 and hemlock may be attacked when near groups of heavily at- 

 tacked pines. Trees from 4 to 5 inches in diameter up to those of 

 the largest size may be attacked. Attacks are usually heaviest 



Figure 60. 



-Long vertical egg galleries are characteristic of mountain pine 

 beetle work. 



