The Forest Ecosystem of Southeast Alaska: Forest insects, by J. S. Hard PDF Download
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Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 40
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Book Description
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 40
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 40
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Book Description
Author: John S. Hard
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 40
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Book Description
Author:
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 0
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Author: Edward H. Holsten
Publisher:
ISBN:
Category : Forest insects
Languages : en
Pages : 248
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Book Description
Author:
Publisher:
ISBN:
Category : Forest insects
Languages : en
Pages : 246
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Book Description
Author: John S. Hard
Publisher:
ISBN:
Category : Forest ecology
Languages : en
Pages : 40
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Book Description
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:
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Category :
Languages : en
Pages : 586
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 206
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Author: Tongass National Forest (Alaska)
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 996
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