Amman, Gene D.; Pasek, Judith E. Mountain pine beetle in ponderosa pine: 

 effects of pliloem tinickness and egg gallery density. Research Paper INT-367. 

 Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain 

 Research Station; 1986 7 p. 



Effects of phloem thickness in ponderosa pine (Pinus ponderosa) on moun- 

 tain pine beetle (Dendroctonus ponderosae) were determined in a laboratory 

 study. Brood production, beetle size, sex ratio, and rate of emergence were sig- 

 nificantly related to phloem thickness, egg gallery density, and attack density. 



KEYWORDS: Scolytidae, bark beetles, Dendroctonus ponderosae, phloem, Pinus 

 ponderosa 



