An edition of Observations on the impact of western spruce budworm on the Nezperce National Forest, Idaho, 1972
(1973)
Observations on the impact of western spruce budworm on the Nezperce National Forest, Idaho, 1972
by William M. Ciesla
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Last edited by Open Library Bot
December 3, 2010 | History
Aerial surveys of the Nezperce National Forest in Idaho revealed 138,692 acres of aerially visible top kill and tree mortality due to repeated defoliation by western spruce budworm, Choristoneura occidentalis Freeman. A small ground sample indicates that up to 47 percent of the grand fir volume was affected by top kill in some areas. True firs were most severely affected by repeated defoliation, and Engelmann spruce was intermediately affected. No top kill or tree mortality was observed on Douglas-fir.
Publish Date
1973
Language
English
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Subjects
Conifers, Defoliation, Diseases and pests, Western spruce budwormPlaces
Idaho, Nezperce National Forest| Edition | Availability |
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Observations on the impact of western spruce budworm on the Nezperce National Forest, Idaho, 1972
1973, USDA, Forest Service, Northern Region, Division of State and Private Forestry
in English
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Book Details
Edition Notes
Caption title.
Includes bibliographical references (leaf 7).
Also issued online.
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| December 3, 2010 | Edited by Open Library Bot | Added subjects from MARC records. |
| December 11, 2009 | Created by WorkBot | add works page |