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Creator:: Dewey, Jerald E. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: A 3-year evaluation of Douglas-fir cones in Montana and Yellowstone National Park, Wyoming, showed the western spruce budworm, Choristoneura occidentalis Freeman, and midges were the most common and injurious insects found each year. Injury was so severe at some plots that no sound seeds could be found.
Resource Type:: Technical Report
Full Text:: . DEPARTMENT OF AGRICULTURE / FOREST SERVICE DIVISION OF STATE AND PRIVATE FORESTRY • NORTHERN REGION

Creator:: Berg, Malcolm J., McGregor, Mark D., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: The mountain pine beetle, Dendroctonus ponderosas Hopk., showed a significant advance northward from the 1970 infestation boundary, encompassing almost one-third of the total Park acreage. A fall survey conducted in the Park showed an average of 71.1 trees per acre with red or fading foliage from previous year's attacks and...
Resource Type:: Technical Report
Full Text:: • • • USDA FOREST SERVICE/NORTHERN

Creator:: Ciesla, William M. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: An evaluation of the status of bark beetle infestations in ponderosa pine stands on Blue Mountain, Missoula District, Lolo National Forest, was made March 30 and April 4, 1972, at the request of personnel of the Missoula District. Extensive group killing of ponderosa pine in the vicinity of Blue Mountain...
Resource Type:: Technical Report
Full Text:: ■ • USDA FOREST SERVICE/NORTHERN REGION Report No. 1-72-2

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:: Haglund, Steve, Dooling, Oscar J., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Dwarf mistletoe is known to reduce both height and diameter growth and thus reduce the yield of an infested stand. This comparison of two similar stands--one healthy and the other infested--gives an indication of the impact of this parasite. The healthy stand has produced 1.5 times the board foot volume...
Resource Type:: Technical Report
Full Text:: .11n1••• n•••••n USDA FOREST SERVICE/NORTHERN REGION 5200

Creator:: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D., and Meyer, Hubert E.
Abstract:: Mountain pine beetle, Dendroctonus ponderosas Hopk., reached near epidemic levels in lodgepole pine stands in the Sulphur Creek-Black Butte area. Lodgepole pine are probably more susceptible due to the overstocked conditions of stands, and high incidence of girdling of the base of trees by porcupines. The infestation in this area...
Resource Type:: Technical Report
Full Text:: USDA FOREST SERVICE/NORTHERN REGION • • • • 5200 Report No. 73

Creator:: United States. Forest Service. Northern Region. State & Private Forestry, Tunnock, Scott, McGregor, Mark D., and Bousfield, Wayne E.
Abstract:: A study was made to determine the distribution of parasites of the larch casebearer, Coleophora laricelia, within crowns of western larch, Larix occidentalis. The most common parasites recovered in order of their abundance, were: Agathis pumila (Ratz.), Diciadocerus sp. near westwoodii, Spilochalcis albifrons (Walsh), and MesopoZobus sp. Parasitism by A....
Resource Type:: Technical Report
Full Text:: WESTERN LARCH TREES IN THE Northern Region • U. S. Department of Agriculture — Forest Service Division

Creator:: Bousfield, Wayne E., Meyer, Hubert E., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Epidemic levels of the pine butterfly, Neophasia menapia (Felder and Felder) have been evident in ponderosa pine stands in the Bitter Root Valley since 1969. Evaluations of this infestation were initiated in 1970 to assess overwintering egg populations at 20 locations within the infestation (Ciesla et al. 1971). Defoliation was...
Resource Type:: Technical Report
Full Text:: USDA FOREST SERVICE/NORTHERN REGION Report No. 72-9 5200

Creator:: Franc, G. C., Underwood, P. W., Dewey, Jerald E., and United States. Forest Service. Northern Region. State & Private Forestry
Resource Type:: Technical Report
Full Text:: A-- • • USDA FOREST SERVICE/NORTHERN REGION • Report No. 1

Creator:: Dooling, Oscar J., Haglund, Steve, Miller, Bob, and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Many nonmerchantable trees on the proposed control areas are moderately to heavily infested with dwarf mistletoe. Control by sanitation-thinning is desirable and is both biologically and economically sound.
Resource Type:: Technical Report
Full Text:: • • USDA FOREST SERVICE/NORTHERN REGION Report No. 72-5 5230

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