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Creator:: United States. Forest Service. Northern Region. Cooperative Forestry & Pest Management, United States. Forest Service. Timber Management, and United States. Forest Service. Planning, Programming, and Budgeting
Resource Type:: Technical Report

Creator:: Hard, John S., Tunnock, Scott, Eder, Robert G., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: 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 from 1.7 million acres in 1969 to a high of 2.2 million acres in 1974, and declined to none in 1979. Defoliated...
Resource Type:: Technical Report

Creator:: Flavell, Thomas H. and United States. Forest Service. Northern Region. State & Private Forestry
Resource Type:: Technical Report

Creator:: Bousfield, Wayne E. and United States. Forest Service. Northern Region. State & Private Forestry
Resource Type:: Technical Report

Creator:: Tunnock, Scott and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: 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, the defoliated area dropped from 831,487 acres in 1975 to 655,711 acres in 1976, down 21 percent. Surveys in...
Resource Type:: Technical Report

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

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