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Creator:: Tunnock, Scott, Flavell, Thomas H., Meyer, Hubert E., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: Aerial surveys of six Montana National Forests in 1975 found a 22.1% increase in the area of visible defoliation caused by the western spruce budworm. It is estimated that 2,278,804 acres of Douglas-fir forests are now suffering at least 25% defoliation. This is an increase of 503,706 acres over the...
Resource Type:: Technical Report
Full Text:: SATE (O Cu .ro) R :1 r.... RS -TY N4t)S n630 1/ Entomologist, Forest Environmental Protection

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

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

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:: Evaluation of no.72-1 ;LAS-FIR CONE AND SEED INSECTS itana and Yellowstone National Park • I U. S

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