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Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 40 pages
File Size : 50,8 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030682
Author : John S. Hard
Publisher : Unknown
Page : 40 pages
File Size : 43,9 Mb
Release : 1974
Category : Forest ecology
ISBN : MINN:30000010192817
Southeast Alaska's remaining virgin forests have few insect pests. The black-headed budworm and the hemlock sawfly, both western hemlock defoliators, are the most important species. They kill some trees, kill tops in others, and cause growth loss, but stands survive their attacks. Extensive conversion of virgin stands to second growth may result in an increase in pest problems as it has in similar areas such as coastal British Columbia. ??Widespread use of insecticides to control major outbreaks is not practical because of risk of contaminating salmon-spawning and trout-rearing streams; but insecticide use may be justified in local, high value areas. Weather, diseases, and parasites control outbreaks naturally. Damage-prone stands should be identified and harvested before insect attack or salvage-logged following outbreaks. Ideally, second-growth stands should be managed for resistance to insect pests.
Author : John S. Hard
Publisher : Unknown
Page : 0 pages
File Size : 53,5 Mb
Release : 1974
Category : Electronic
ISBN : OCLC:863460401
Author : Anonim
Publisher : Unknown
Page : 246 pages
File Size : 44,8 Mb
Release : 2001
Category : Forest insects
ISBN : MINN:30000007001823
Author : Edward H. Holsten
Publisher : Unknown
Page : 248 pages
File Size : 48,8 Mb
Release : 2009
Category : Forest insects
ISBN : UCD:31175033169544
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 36 pages
File Size : 48,5 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030729
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 120 pages
File Size : 55,8 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030736
Author : Anonim
Publisher : Unknown
Page : 586 pages
File Size : 42,5 Mb
Release : 1997
Category : Electronic
ISBN : NWU:35556030817183
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 40 pages
File Size : 46,5 Mb
Release : 1974
Category : Forest ecology
ISBN : UOM:39015001294647
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 28 pages
File Size : 54,6 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030712
Author : Tongass National Forest (Alaska)
Publisher : Unknown
Page : 996 pages
File Size : 46,8 Mb
Release : 1990
Category : Forest management
ISBN : MINN:31951D01143381Z
Author : Tongass National Forest (Alaska)
Publisher : Unknown
Page : 986 pages
File Size : 41,5 Mb
Release : 1990
Category : Forest management
ISBN : MSU:31293026428346
Author : Edward H. Holsten,Richard Allen Werner,Thomas H. Laurent
Publisher : Unknown
Page : 208 pages
File Size : 47,7 Mb
Release : 1981
Category : Forest insects
ISBN : MINN:31951002876575Q
Author : A. S. Harris,Wilbur A. Farr
Publisher : Unknown
Page : 120 pages
File Size : 42,7 Mb
Release : 1974
Category : Forest ecology
ISBN : UIUC:30112102049589
Large-scale use of the timber resource of southeast Alaska began in 1953 after long efforts to establish a timber industry. Development and present status of the industry and present management of the timber resource are summarized, stressing the biological basis for timber management activities in southeast Alaska today. Ecological and silvicultural considerations related to timber harvest, reforestation, and stand development are discussed. Published and unpublished information are brought together. Current management practices are discussed as a basis for a better understanding of how this information can be helpful in managing the timber resource and to point out where research is needed.
Author : Anonim
Publisher : Unknown
Page : 744 pages
File Size : 49,6 Mb
Release : 1974
Category : Forest ecology
ISBN : STANFORD:36105005945147
