Effects of Semistarvation During Late Larval Stages on Survival and Fecundity of the Hemlock Sawfly in the Laboratory PDF Download
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Author: John S. Hard
Publisher:
ISBN:
Category : Hemlock sawfly
Languages : en
Pages : 8
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Book Description
Author: John S. Hard
Publisher:
ISBN:
Category : Hemlock sawfly
Languages : en
Pages : 8
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Book Description
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 446
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Book Description
Author: John S. Hard
Publisher:
ISBN:
Category : Hemlock sawfly
Languages : en
Pages : 24
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Book Description
Author: Jerry F. Franklin
Publisher:
ISBN:
Category : H.J. Andrews Experimental Forest (Or.)
Languages : en
Pages : 356
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Book Description
Author: R. A. Mask
Publisher:
ISBN:
Category : Alaska
Languages : en
Pages : 58
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1194
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1388
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1408
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Book Description
Author: Robert W. Sassaman
Publisher:
ISBN:
Category : Forest thinning
Languages : en
Pages : 768
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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.
