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Filtering by: Creator Davis, Adam S. Creator United States. Forest Service. Northern Region. State & Private Forestry Subject Conifers -- Diseases and pests -- Montana

Western spruce budworm in the Northern Region in 1977 and predictions for defoliation in 1978

Creator:

Flavell, Thomas H. and United States. Forest Service. Northern Region. State & Private Forestry

Resource Type:

Technical Report

Full Text:

U.S. Forest Service Methods Application Group at Davis, California. Data from the 1976 egg mass
Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977

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

Full Text:

's, infestations have fluctuated in size, but persisted in northern Idaho and western and eastern

ScholarsArchive@OSU

Western spruce budworm in the Northern Region in 1977 and predictions for defoliation in 1978

Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977

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