Population Dynamics Of Dwarf Mistletoe On Young True Firs In The Central Sierra Nevada California
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Population Dynamics Of Dwarf Mistletoe On Young True Firs In The Central Sierra Nevada California
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Author : Robert F. Scharpf
language : en
Publisher:
Release Date : 1982
Population Dynamics Of Dwarf Mistletoe On Young True Firs In The Central Sierra Nevada California written by Robert F. Scharpf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Arceuthobium categories.
Young red firs (Abies magnifica A. Murr.) and white firs (A. concolor [Gord. & Glend.] Lindl. ex Hildebr.) on the Stanislaus National Forest, California, were inoculated with seeds of dwarf mistletoe (Arceuthobium abietinum) for 5 successive years. Only 3 to 4 percent of about 7000 seeds placed on branches resulted in infections. Second-generation infections developed and populations of the parasite built up on some trees but not on others after 17 years. Variables that appeared to regulate population increases included an 8- to 9-year average between inoculation and fruiting of plants, low rate of fruit production among female plants, low proportion of plants producing abundant fruit (100 or more/year), and irregular production of fruit on plants over the years, Death of infected branches also helped keep populations of the parasite in check. In vigorous, well-managed stands of young firs, dwarf mistletoe populations may not build up rapidly enough to result in serious losses.
Population Dynamics Of Dwarf Mistletoe On Young True Firs In The Central Sierra Nevada California
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Author : Robert F. Scharpf
language : en
Publisher:
Release Date : 1982
Population Dynamics Of Dwarf Mistletoe On Young True Firs In The Central Sierra Nevada California written by Robert F. Scharpf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Fir Dwarf Mistletoe
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Author : Gregory M. Filip
language : en
Publisher:
Release Date : 2000
Fir Dwarf Mistletoe written by Gregory M. Filip and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Douglas fir categories.
Dwarf Mistletoes
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Author : Frank G. Hawksworth
language : en
Publisher: DIANE Publishing
Release Date : 1998-04
Dwarf Mistletoes written by Frank G. Hawksworth and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-04 with categories.
Contents: generalized life cycle; sexual reproductive biology; mechanism and trends of evolution; biogeography and paleogeographic history; host relationships; ecological relationships; biotic associates; host-parasite physiology; anatomy of the dwarf mistletoe shoot system; endophytic system; pathogenic effects; control; systematics: philosophy, problems, and criteria for classification; molecular systematics; formal taxonomy. Extensive bibliography. Scientific and common names; collecting and curating techniques; herbaria consulted; specimens examined; glossary; subject and species indexes.
Population Buildup And Vertical Spread Of Dwarf Mistletoe On Young Red And White Firs In California
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Author : Robert F. Scharpf
language : en
Publisher:
Release Date : 1976
Population Buildup And Vertical Spread Of Dwarf Mistletoe On Young Red And White Firs In California written by Robert F. Scharpf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Abies concolor categories.
Rate of population buildup of dwarf mistletoe, Arceuthobium abietinum Engelm. ex Munz., was slow in most small red firs and white firs 12 to 15 years after inoculation with the parasite. Where population buildup did occur, it remained clustered in the lower portions of tree crowns near inoculation sites. Maximum distance of vertical spread was 16 feet (4.8 m), after 15 years. The mean annual rate of vertical spread of the parasite in 12 to 15 years was 3 inches (7 cm) or less in test trees. No vertical spread occurred in some trees. Rate of vertical spread was much slower in all trees than the mean annual height growth of vigorous young red or white firs. Therefore, the test trees were outgrowing the spread of dwarf mistletoe within tree crowns. Vertical spread rate and rate of tree height growth together determine the proportion of tree crown that will be infested at a given time after inoculation.
One Seed Source Of Jeffrey Pine Shows Resistance To Dwarf Mistletoe
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Author : Robert F. Scharpf
language : en
Publisher:
Release Date : 1992
One Seed Source Of Jeffrey Pine Shows Resistance To Dwarf Mistletoe written by Robert F. Scharpf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Dwarf mistletoes categories.
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1984
Monthly Catalogue United States Public Documents 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 Government publications categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1984
Monthly Catalog Of United States Government Publications 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 Government publications categories.
Dwarf Mistletoe In Red And White Firs In California 23 To 28 Years After Inoculation
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Author : J. R. Parmeter
language : en
Publisher:
Release Date : 1989
Dwarf Mistletoe In Red And White Firs In California 23 To 28 Years After Inoculation written by J. R. Parmeter 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.
Spread and buildup of dwarf mistletoe, Arceuthobiun abietinum, was studied on inoculated white fir, Abies concolor, and red fir, A. magnifica, in northern Califomia for 23 to 28 years. At the end of these studies (1986), and in the absence of overstory infection, 13 of 23 trees had dwarf mistletoe populations that were the same or smaller than the original populations resulting from inoculation. Mortality of infections was the main factor limiting population increases. Live crown ratio of all trees averaged over 0.8. The average ratio of tree height growth to vertical spread rate of dwarf mistletoe was 11.5 to 1 in white fir and 7 to 1 in red fir in the Sierra Nevada. In the southem Cascades, the average ratio was 1.7 to 1 in red fir. About one fourth of the trees became infected in the bole. Of 14 additional trees infected by lateral spread of the parasite, 13 were within 6 m of the source of infection. Evidence continues to indicate that losses from dwarf mistletoes will be small in well-managed young fir stands free from infected overstory trees and properly spaced to promote good growth.
Proceedings Of The Annual Western International Forest Disease Work Conference
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Author :
language : en
Publisher:
Release Date : 1978
Proceedings Of The Annual Western International Forest Disease Work Conference 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 Forest protection categories.