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Author : Anonim
Publisher : Unknown
Page : 328 pages
File Size : 43,6 Mb
Release : 1958
Category : Forest insects
ISBN : CORNELL:31924017212378
Author : Anonim
Publisher : Unknown
Page : 32 pages
File Size : 50,6 Mb
Release : 1979
Category : Forest insects
ISBN : OSU:32435055981450
Author : Anonim
Publisher : Unknown
Page : 20 pages
File Size : 53,7 Mb
Release : 1970
Category : Forest insects
ISBN : OSU:32435055981757
Author : Anonim
Publisher : Unknown
Page : 616 pages
File Size : 51,8 Mb
Release : 1965
Category : Forest insects
ISBN : CORNELL:31924003842113
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.),P. W. Orr
Publisher : Unknown
Page : 36 pages
File Size : 54,6 Mb
Release : 1956
Category : Forest insects
ISBN : CORNELL:31924018352215
Author : Western Forestry and Conservation Association. Western Forest Pest Committee
Publisher : Unknown
Page : 506 pages
File Size : 40,7 Mb
Release : 1962
Category : Forest insects
ISBN : CORNELL:31924061344853
Author : Ellen Michaels Goheen,Elizabeth A. Willhite
Publisher : Forest Service
Page : 344 pages
File Size : 45,5 Mb
Release : 2006
Category : Gardening
ISBN : UCD:31175030819661
Author : United States. Forest Service
Publisher : Unknown
Page : 654 pages
File Size : 54,6 Mb
Release : 2024-07-02
Category : Forest insects
ISBN : STANFORD:36105028903289
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 52 pages
File Size : 48,7 Mb
Release : 1938
Category : Forests and forestry
ISBN : UIUC:30112055200122
Author : Anonim
Publisher : Unknown
Page : 48 pages
File Size : 42,9 Mb
Release : 1980
Category : Forest insects
ISBN : CORNELL:31924017242987
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 76 pages
File Size : 51,9 Mb
Release : 1965
Category : Electronic
ISBN : STANFORD:36105130405256
Author : John S. Hard
Publisher : Unknown
Page : 40 pages
File Size : 46,5 Mb
Release : 1974
Category : Forest ecology
ISBN : SRLF:DD0000114884
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 : Anonim
Publisher : Unknown
Page : 228 pages
File Size : 45,7 Mb
Release : 2007
Category : Government publications
ISBN : WISC:89117126698
Author : United States. Forest Service
Publisher : Unknown
Page : 536 pages
File Size : 44,8 Mb
Release : 1962
Category : Forest insects
ISBN : UOM:39015046520121
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 644 pages
File Size : 53,9 Mb
Release : 1957
Category : Electronic
ISBN : STANFORD:36105130403798