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acre ACRICULTURE FOREST SERVICE aspect aspen average banksiana bark depth bark thickness blister rust burning cheatgrass cones conifer contorta damage DEPARTMENT OF ACRICULTURE diameter dicamba Douglas-fir effects elevation equation estimate fascicles feet Figure fire Forest and Range Forest Service Research Forestry Sciences Laboratory germination grand fir growing season height growth hybrids Idaho ignition illus inches infected infiltrometers jack pine lightning lodgepole pine maintained in cooperation mature measured Montana mountain pine beetle National Forest observed percent Pinus monticola plants plots pollens ponderosa pine Priest River progenies Range Exp recorded resistance rooting sampling seed seedbed seedlings Service Research Note shade slopes soil moisture soil moisture depletion species specific gravity sprout stand stem surface temperature tissue treatment tubes U.S. Forest Serv UNITED STATES DEPARTMENT University of Idaho USDA Forest Service Utah variable variation vegetation western larch western white pine wind