INSECT ENEMIES OP WESTERN FORESTS 



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Figure 68. — A, Typical galleries of the Oregon pine engraver score the 

 sapwood; B, adult, X 4. 



length of season. The parent adults often emerge and make a 

 second and even a third attack that results in a confusing over- 

 lapping of broods. Preventing these beetles from becoming too 

 numerous through timely slash disposal will do more to prevent 

 damage than the application of control measures after damage has 

 occurred. 



The Monterey pine engraver (Ips radiatae Hopk.) attacks liv- 

 ing, injured, dying, and recently felled Monterey, Bishop, knob- 

 cone, lodgepole, and whitebark pines from central California 

 northward to British Columbia and eastward to Idaho and Wyom- 

 ing. It is usually a secondary enemy and associated with other 

 bark beetles in its attack, but at times may become primary, espe- 



