Search
You searched for:
Start Over
Forests
Remove constraint Forests
Author
United States. Forest Service. Northern Region. State & Private Forestry
Remove constraint Author: United States. Forest Service. Northern Region. State & Private Forestry
Subject
Conifers -- Diseases and pests -- Montana
Remove constraint Subject: Conifers -- Diseases and pests -- Montana
1 - 8 of 8
Search Results
-
1. [Article] Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977
Epidemic populations of the western spruce budworm persist in the Northern Region. Aerial surveys made in August 1976 showed a decline in the acreage of aerially visible defoliation. In northern Idaho, ...Citation -
4. [Article] An assessment of dwarf mistletoes in Montana
Dwarf mistletoes reduce tree height and diameter, and thereby cause a reduction in volume production. We estimate that volume reduction in Montana is about 33.2 MM cubic feet per year. Mistletoe effects ...Citation -
5. [Article] An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II
Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several ...Citation -
6. [Article] Bark beetle conditions, Northern Region, 1978
-
Methods used to establish permanent plots in precommercially thinned and unthinned stands to monitor root disease development are described. Plots were established in 22 Armillaria-infested stands in northern ...
Citation -
8. [Article] Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979
Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased ...Citation