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Creator:: Tunnock, Scott, Kohler, Steve, and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: In 1973, two centers of defoliation by Douglas-fir tussock moth totaling 350 acres were detected near Missoula, Montana. Egg mass surveys showed two sections south of Frenchtown and one section northwest of Lolo 41, contain sufficient egg mass population to cause heavy defoliation in 1974.
Resource Type:: Technical Report
Full Text:: USDA traREST SERVICE NORTHERN REGION • 11. 5200 • Report No

Creator:: McGregor, Mark D. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: An outbreak of the pine engraver Ips pini (Say), was reported by Sonny LaSalle, Forester, in a mixed second-growth Douglas-fir,lodgepole, ponderosa pine stand on the Sandpoint Ranger District near Edgemere, Idaho. This report was received in early January 1974. An evaluation of the infestation was made April 18, 1974.
Resource Type:: Technical Report
Full Text:: - 510--/441 - A9 T eisti151 USDA FOREST SERVICE/NORTHERN REGION

Creator:: Tunnock, Scott and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: An attempt was made in January 1971 to relate the numbers of hibernating western spruce budworm larvae on a square foot of bark surface with subsequent shoot damage on Douglas-fir and grand fir in northern Idaho. Twenty-six plots sampled in January were also sampled in April to determine if larval...
Resource Type:: Technical Report
Full Text:: • 0 • USDA FOREST SERVICE/NORTHERN REGION Report No. 72-8

Creator:: McGregor, Mark D. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: This report documents the establishment of a study to determine the effect of thinning on incidence of mountain pine beetle, Dendroctonus ponderosae Hopk., infestation in second-growth ponderosa pine stands in western Montana. Although insufficient time has passed for a similar study in Oregon to yield a solid base for a...
Resource Type:: Technical Report
Full Text:: )/\ • • USDA FOREST SERVICE/NORTHERN REGION Report

Creator:: Dewey, Jerald E. and United States. Forest Service. Northern Region. State & Private Forestry
Resource Type:: Technical Report
Full Text:: , USDA Forest Service, Region 1, Division of State and Private Forestry, Missoula, Montana, 3

Creator:: Tunnock, Scott and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: An attempt was made to predict western spruce budworm defoliation using egg counts from plots in the Douglas-fir type east of the Continental Divide in Montana, the Douglas-fir type west of the Continental Divide in Montana, and the mixed grand fir Douglas-fir type of northern Idaho. The parameters used in...
Resource Type:: Technical Report
Full Text:: USDA FOREST SERVICE/NORTHERN REGION 5t)/(/-4411,1 Report No. 74

Creator:: Hamel, Dennis R., McGregor, Mark D., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: An infestation of a defoliating weevil, Magdalis gentilis LeConte, was reported in July by Hank Manning, Judith Ranger District forester, Lewis and Clark National Forest. The infestation occurs in precommercially thinned stands of lodgepole pine, Pinus contorta var./atifblia Engelm. in the Moose Creek drainage. Although damages caused by M. gentilis...
Resource Type:: Technical Report
Full Text:: a USDA FOREST SERVICE NORTHERN REGION 5200 Report No. 74-23

Creator:: Dooling, Oscar J., Haglund, Steve, and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Many understory trees on proposed control areas are lightly to moderately infested with dwarf mistletoe. Control by thinning/ sanitation after logging will reduce infestations to a tolerable level and significantly increase volume yields in the future. The cost-benefit ratio of control is favorable.
Resource Type:: Technical Report
Full Text:: USDA FOREST SERVICE/NORTHERN REGION EVALUATION OF PROPOSED DWARF

Creator:: McGregor, Mark D. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Mountain pine beetle infestations have continued at epidemic level in lodgepole pine stands since 1969 in the West Gallatin River drainage. This infestation has increased at about a 1.9:1 buildup ratio annually. Since the outbreak began in 1969, surveys indicate that approximately 22,354 merchantable size trees have been killed with...
Resource Type:: Technical Report
Full Text:: ) A ) USDA FOREST SERVICE/NORTHERN REGION 5200 Report No. 74-17

Creator:: Tunnock, Scott and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: A looper, probably the Bruce spanworm, Operophtera bruceata (Hulst), defoliated more than 15,650 acres of quaking aspen in the Turtle Mountains of North Dakota in the spring of 1973.
Resource Type:: Technical Report

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