Cole, Walter E., E. Park Guymon, and Chester E. Jensen. 

 1981. Monoterpenes of lodgepole pine phloem as related to mountain pine 

 beetles. USDA For. Serv. Res. Pap. INT-281, 10 p. Intermt. For. and Range 

 Exp. Stn., Ogden, Utah 84401. 



Phloem samples taken from 86 healthy lodgepole pine trees were analyzed for 

 content of dry matter, starch, various forms of sugar and nitrogen, and of selected 

 monoterpenes. p-phellandrene was, by far, the most prevalent of the mono- 

 terpenes. An interactive hypothesis is developed for terpene content as a function of 

 phloem thickness, radial growth, and tree diameter. Here, high concentrations of 

 monoterpenes coincide with upper tree diameters, the expected region of high 

 mountain pine beetle survival success. 



KEYWORDS: phloem constituents, lodgepole pine, Pinus contorta var. latifolia, 

 sugars, starch, nitrogen, monoterpenes, mountain pine beetle, De- 

 ndroctonus ponderosae. 



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