Download or read book Western Hemlock Damage Caused by the Black headed Budworm written by George L. Downing and published by . This book was released on 1957 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Western Hemlock Damage Caused by the Black headed Budworm Appraisal Survey written by G. L. Downing and published by . This book was released on 1957 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Western Black headed Budworm and Hemlock Sawfly in Alaska written by R. A. Mask and published by . This book was released on 1992 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USDA Forest Service General Technical Report PNW written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1974 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by Institute of Northern Forestry (U.S.) and published by . This book was released on 1960 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1952 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Forest Ecosystem of Southeast Alaska written by A. S. Harris and published by . This book was released on 1974 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-scale use of the timber resource of southeast Alaska began in 1953 after long efforts to establish a timber industry. Development and present status of the industry and present management of the timber resource are summarized, stressing the biological basis for timber management activities in southeast Alaska today. Ecological and silvicultural considerations related to timber harvest, reforestation, and stand development are discussed. Published and unpublished information are brought together. Current management practices are discussed as a basis for a better understanding of how this information can be helpful in managing the timber resource and to point out where research is needed.

Download or read book Information Report written by and published by . This book was released on 1985 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Forest Ecosystem of Southeast Alaska Forest ecology and timber management by A S Harris and W A Farr written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1974 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Forest Ecosystem of Southeast Alaska written by and published by . This book was released on 1974 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Station Paper written by and published by . This book was released on 1959 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Forest Ecosystem of Southeast Alaska Forest insects by J S Hard written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Forest Ecosystem of Southeast Alaska written by John S. Hard and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Forest Ecosystem of Southeast Alaska written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report of the Pacific Northwest Forest and Range Experiment Station for the Calendar Year written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1952 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biennial Report 1958 1959 written by and published by . This book was released on 1960 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forest Insect Conditions in the Pacific Northwest written by and published by . This book was released on 1958 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: