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Filtering by: Creator Tunnock, Scott Subject Conifers -- Diseases and pests -- Idaho Subject Western spruce budworm -- Montana

Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979

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
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