Download or read book Balsam Woolly Aphid written by R. Ladd Livingston and published by . This book was released on 1983 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Balsam Woolly Aphid written by R. G. Mitchell and published by . This book was released on 1970 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infestation Trends of Balsam Woolly Aphid in an Abies Alba Plantation in North Carolina written by Gene D. Amman and published by . This book was released on 1971 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Keys to Predators of the Balsam Woolly Aphid in North Carolina written by Gene D. Amman and published by . This book was released on 1970 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Balsam Fir written by Egolfs V. Bakuzis and published by U of Minnesota Press. This book was released on 1965 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution of Redwood Caused by the Balsam Woolly Aphid in Fraser Fir of North Carolina written by Gene D. Amman and published by . This book was released on 1970 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examination of 5-foot sections of felled Fraser fir, Abies fraseri (Pursh) Poir., trees infested or killed by the balsam woolly aphid, Adelges piceae (Ratzeburg), revealed that the height of the first annual ring of aphid-caused redwood increased as the height of the trees increased. The number of red rings varied from two in a tree 5 inches in d.b.h. to five or six in all trees 9 or more inches in d.b.h., indicating that larger trees can sustain aphid attacks for longer periods before death than can smaller trees.
Download or read book The Balsam Woolly Aphid written by Robert Imre Gara and published by . This book was released on 1972 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Forest Insect Populations written by Alan A. Berryman and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Insects multiply. Destruction reigns. There is dismay, followed by outcry, and demands to Authority. Authority remembers its experts or appoints some: they ought to know. The experts advise a Cure. The Cure can be almost anything: holy water from Mecca, a Government Commis sion, a culture of bacteria, poison, prayers denunciatory or tactful, a new god, a trap, a Pied Piper. The Cures have only one thing in common: with a little patience they always work. They have never been known entirely to fail. Likewise they have never been known to prevent the next outbreak. For the cycle of abundance and scarcity has a rhythm of its own, and the Cures are applied just when the plague of insects is going to abate through its own loss of momentum. -Abridged, with insects in place of voles, from C. Elton, 1924, Voles, Mice and Lemmings, with permission of Oxford University Press This book is an enquiry into the "natural rhythms" of insect abundance in forested ecosystems and into the forces that give rise to these rhythms. Forests form unique environ ments for such studies because one can find them growing under relatively natural (pri meval) conditions as well as under the domination of human actions. Also, the slow growth and turnover rates of forested ecosystems enable us to investigate insect popula tion dynamics in a plant environment that remains relatively constant or changes only slowly, this in contrast to agricultural systems, where change is often drastic and frequent.
Download or read book USDA Forest Service Research Note SE written by and published by . This book was released on 1968 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Library of Congress Subject Headings written by Library of Congress and published by . This book was released on 2013 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Foresters Almanac 1977 written by and published by . This book was released on 1977 with total page 222 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 1961 with total page 496 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:
Download or read book U S Forest Service Research Paper PNW written by and published by . This book was released on 1965 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Forest Service Research Paper PNW written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1964 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Progress of Radial Growth of Douglas fir Western Redcedar and Red Alder written by Donald L. Reukema and published by . This book was released on 1965 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book USDA Forest Service Research Note SE written by Southeastern Forest Experiment Station (Asheville, N.C.) and published by . This book was released on 1963 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
