AUTHORS 



RESEARCH SUMMARY 



DALE L. BARTOS is an operations research analyst with 

 the Mountain Pine Beetle Population Dynamics research 

 work unit, Ogden, UT. He joined the unit in 1 984 and is cur- 

 rently located in Logan, UT. Prior to assuming his current 

 position, he was with the Intermountain Research Station as 

 a member of the aspen ecosystem project for 1 2 years. He 

 holds B.S. and M.S.degrees from Fort Hays Kansas State 

 University, and a Ph.D. degree in range science from Colo- 

 rado State University. His principle research interests are in 

 systems modeling and ecological processes. 



GENE D. AMMAN is Project Leader of the Mountain Pine 

 Beetle Population Dynamics research work unit. He joined 

 the unit in 1 966. Prior to joining the Intermountain Station, 

 he was research entomologist with the Forest Service's 

 Southeastern Forest Experiment Station in Asheville, NC, 

 doing biological control and ecological research on the bal- 

 sam woolly adelgid. He began his Forest Service career 

 with the Rocky Mountain Forest and Range Experiment 

 Station in Fort Collins, CO, as research assistant on sam- 

 pling populations and mortality factors of mountain pine 

 beetle and spruce bark beetle. He has B.S. and M.S. de- 

 grees from Colorado State University and a Ph.D. degree 

 from the University of Michigan. 



Microclimates of thinned and unthinned stands of lodge- 

 pole pine (Pinus contorta var. latifolia Engelm.) were moni- 

 tored and related to mountain pine beetle (Dendroctonus 

 ponderosae Hopkins [Coleoptera: Scolytidae]) response. 

 Thinning lodgepole pine stands increased light intensity, 

 wind movement, insolation, and temperature. Temperatures 

 on the south exposure of tree trunks and of soil were signifi- 

 cantly higher in thinned than unthinned stands. Light and 

 wind also were higher in the thinned stand. Fewer mountain 

 pine beetles (5 percent of the total) were caught in 

 pheromone-baited traps in a thinned than in an adjacent 

 unthinned stand. Percentage of trees killed by mountain 

 pine beetle was only 2 percent in a thinned stand, compared 

 to 16 percent in an adjacent unthinned stand. 



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Intermountain Research Station 

 324 25th Street 

 Ogden, UT 84401 



