Author: Paul E. AhoPublisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 28
Book Description
Decay in Tops Killed by Douglas-fir Tussock Moth in the Blue Mountains
Author: Paul E. AhoPublisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 28
Book Description
Decay in Tops Killed by Douglas-fir Tussock Moth in the Blue Mountains
Author: Paul E. AhoPublisher:
ISBN:
Category : Douglas fir tussock moth
Languages : en
Pages : 0
Book Description
Losses Associated with Douglas-fir and True Fir Tops Killed by Western Spruce Budworm in Eastern Washington
Author: Paul E. AhoPublisher:
ISBN:
Category : Defoliation
Languages : en
Pages : 12
Book Description
Physical and chemical properties of some Blue Mountain soils in the northeastern Oregon
Author: J. Michael GeistTree Mortality and Top-kill Related to Defoliation by the Douglas-fir Tussock Moth in the Blue Mountains Outbreak
Author: Boyd E. WichmanPublisher:
ISBN:
Category : Defoliation
Languages : en
Pages : 56
Book Description
The Douglas-fir Tussock Moth
Author: United States. Forest ServicePublisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 360
Book Description
USDA Forest Service Research Paper PNW.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 544
Book Description
Dynamics of Forest Insect Populations
Author: Alan A. BerrymanPublisher: Springer Science & Business Media
ISBN: 1489907890
Category : Science
Languages : en
Pages : 608
Book Description
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.
Research Paper PNW.
Author: Boyd E. WickmanPublisher:
ISBN:
Category : Defoliation
Languages : en
Pages : 384
Book Description
Decay of Grand Fir in the Blue Mountains of Oregon and Washington
Author: Paul E. AhoPublisher:
ISBN:
Category : Abies grandis
Languages : en
Pages : 24
Book Description