Using Indicator Plants To Assess Susceptibility Of California Red Fir And White Fir To The Fir Engraver Beetle
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Using Indicator Plants To Assess Susceptibility Of California Red Fir And White Fir To The Fir Engraver Beetle
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Author : George T. Ferrell
language : en
Publisher:
Release Date : 1986
Using Indicator Plants To Assess Susceptibility Of California Red Fir And White Fir To The Fir Engraver Beetle written by George T. Ferrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Abies concolor categories.
Using a Vegetation Drought Index (VDI) for estimating the susceptibility of California red and white firs to the fir engraver beetle (Scolytus ventralis) was evaluated in northern California forests where these true firs (Abies species) occur in mixed conifer and true fir stands. Midway through the summer drought, true fir moisture stress-a known predisposing factor-was highest on sites with highest VDI values (most xeric). In mixed conifer stands, the susceptibility of white firs-as indicated by the mean percentage of their basal area killed annually-was highest on sites with highest VDI values. But in true fir stands, the susceptibility of mixed red and white firs was highest on sites with the lowest VDI values. Regression models with VDI, stand basal area, and percentage of true fir as regressors lacked the required predictive range and precision, suggesting that VDI will likely have to be used in combination with predictors other than, or in addition to, those analyzed.
Using Indicator Plants To Assess Susceptibility Of California Red Fir And White Fir To The Fir Engraver Beetle
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Author : George T. Ferrell
language : en
Publisher:
Release Date : 1986
Using Indicator Plants To Assess Susceptibility Of California Red Fir And White Fir To The Fir Engraver Beetle written by George T. Ferrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Research Note Psw
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Author :
language : en
Publisher:
Release Date : 1978
Research Note Psw written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Forests and forestry categories.
Forestry Research West
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Author :
language : en
Publisher:
Release Date : 1984
Forestry Research West written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Forests and forestry categories.
The Fir Engraver Beetle
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Author : George R. Struble
language : en
Publisher:
Release Date : 1937
The Fir Engraver Beetle written by George R. Struble and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1937 with Abies concolor categories.
Dynamics Of Forest Insect Populations
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Author : Alan A. Berryman
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Dynamics Of Forest Insect Populations written by Alan A. Berryman and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.
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.
Genetics Silviculture Workshop Proceedings August 27 31 1990 Wenatchee Washington
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Author :
language : en
Publisher:
Release Date : 1991
Genetics Silviculture Workshop Proceedings August 27 31 1990 Wenatchee Washington written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Forest genetics categories.
Ten Year Risk Rating Systems For California Red Fir And White Fir
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Author : George T. Ferrell
language : en
Publisher:
Release Date : 1989
Ten Year Risk Rating Systems For California Red Fir And White Fir written by George T. Ferrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Abies concolor categories.
Publications Quarterly List
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Author :
language : en
Publisher:
Release Date : 1985
Publications Quarterly List written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Forests and forestry categories.
Proceedings Of The Tenth Intermountain Region Silvicultural Workshop
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Author :
language : en
Publisher:
Release Date : 1992
Proceedings Of The Tenth Intermountain Region Silvicultural Workshop written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Biodiversity conservation categories.