Aquatic Insects in Alaska
Author: John Hudson
Publisher:
Published: 2012
Total Pages: 140
ISBN-13: 9780939431380
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Author: John Hudson
Publisher:
Published: 2012
Total Pages: 140
ISBN-13: 9780939431380
DOWNLOAD EBOOKAuthor: Kimberly T. Huntzinger
Publisher:
Published: 2003
Total Pages: 134
ISBN-13:
DOWNLOAD EBOOKAuthor: Samantha Diane Hertel
Publisher:
Published: 2016
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: John S. Hard
Publisher:
Published: 1974
Total Pages: 40
ISBN-13:
DOWNLOAD EBOOKSoutheast 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: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher:
Published: 1974
Total Pages: 40
ISBN-13:
DOWNLOAD EBOOKAuthor: John Hudson
Publisher:
Published: 2005
Total Pages: 52
ISBN-13:
DOWNLOAD EBOOKAuthor: Roger J. Reed
Publisher:
Published: 1966
Total Pages: 24
ISBN-13:
DOWNLOAD EBOOKAuthor: Richard W. Merritt
Publisher: Kendall Hunt
Published: 1996
Total Pages: 894
ISBN-13: 9780787232412
DOWNLOAD EBOOKAuthor: D. J. Larson
Publisher: NRC Research Press
Published: 2000
Total Pages: 997
ISBN-13: 0660179679
DOWNLOAD EBOOKThis book first reviews the biology of Dytiscidae or water beetles, including life history and ecology. It then defines and keys adults & larvae (when known) of dytiscid fauna of Canada, the United States, and for some taxa also northern Mexico. The focus is on the fauna of Canada & Alaska, and adults of the 276 species known from this region are treated in detail. For each Canadian-Alaskan species, the following information is presented: nomenclature & synonymy; selected references; description, including illustrations of taxonomically important characteristics; comments on classification or variation; notes on ecology; and description of the species range, accompanied by a map of collection records. Checklists of the dytiscid fauna of Canada/Alaska are also presented, with the distribution of the species recorded by province/territory and Canadian ecozone. Includes systematic index.
Author: Edward H. Holsten
Publisher:
Published: 2009
Total Pages: 246
ISBN-13:
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