Identification of Destructive Alaska Forest Insects
Author : John S. Hard
Publisher :
Page : 24 pages
File Size : 23,53 MB
Release : 1967
Category : Beneficial insects
ISBN :
Author : John S. Hard
Publisher :
Page : 24 pages
File Size : 23,53 MB
Release : 1967
Category : Beneficial insects
ISBN :
Author : United States. Forest Service
Publisher :
Page : 19 pages
File Size : 34,67 MB
Release : 1967
Category :
ISBN :
Author :
Publisher :
Page : 19 pages
File Size : 39,45 MB
Release : 1967
Category : Forest insects
ISBN :
Author : John S. Hard
Publisher :
Page : 24 pages
File Size : 35,84 MB
Release : 1967
Category : Beneficial insects
ISBN :
Author :
Publisher :
Page : 246 pages
File Size : 43,80 MB
Release : 2001
Category : Forest insects
ISBN :
Author : John S. Hard
Publisher :
Page : 40 pages
File Size : 20,69 MB
Release : 1974
Category : Forest ecology
ISBN :
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 : Edward H. Holsten
Publisher :
Page : 246 pages
File Size : 13,34 MB
Release : 2009
Category : Forest insects
ISBN :
Author : Edward H. Holsten
Publisher :
Page : 248 pages
File Size : 29,95 MB
Release : 2009
Category : Forest insects
ISBN :
Author : George L. Downing
Publisher :
Page : 4 pages
File Size : 10,26 MB
Release : 1957
Category :
ISBN :
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher :
Page : 40 pages
File Size : 22,32 MB
Release : 1974
Category : Forest ecology
ISBN :