Radial Growth Losses in Douglas-Fir and White Fir Caused by Western Spruce Budworm in Northern New Mexico: 1700-1983

Persistent Link:
http://hdl.handle.net/10150/302602
Title:
Radial Growth Losses in Douglas-Fir and White Fir Caused by Western Spruce Budworm in Northern New Mexico: 1700-1983
Author:
Swetnam, Thomas W.
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona
Publisher:
Laboratory of Tree-Ring Research, University of Arizona (Tucson, AZ)
Issue Date:
31-Oct-1985
Description:
Final Report / Contract on 43-8371-4-628 / For: USDA, Forest Service, Southwestern Region
URI:
http://hdl.handle.net/10150/302602
Abstract:
Regional outbreaks of western spruce budworms (Choristoneura occidentalis Freeman) have recurred at least three times in northern New Mexico since the early 1920's when the U. S. Forest Service first began systematic forest-pest surveys and documentation (Lessard 1975, U. S. Forest Service documents). The current outbreak was first noticed in a small area on the Taos Indian Reservation in 1974, and since then the defoliated areas have increased in New Mexico and Arizona to more than 370,000 acres of Federal, Indian, State and private lands (Linnane 1984). Losses in timber values can generally be ascribed to radial growth loss, height growth loss, topkilling, reduced regeneration, and mortality (Carlson et al. 1983, Fellin et al. 1983). A damage assessment project was initiated in 1978 and was aimed at obtaining measurements of some of these losses in budworm infested stands on the Carson National Forest, New Mexico (Holland and Lessard 1979). A large data base has subsequently been developed, including yearly measurements on topkilling, mortality, defoliation, and insect population changes (Stein 1980, 1981, Stein and McDonnell 1982, Rogers 1984). A growth assessment study was undertaken in 1982 to determine the feasibility of using dendrochronological methods to identify the timing of past outbreaks and to quantify radial growth losses associated with budworm defoliation (Swetnam 1984). Results of this work showed that three major outbreaks during the twentieth century were clearly visible in the tree-ring samples obtained from currently infested trees. The radial growth of host trees was corrected for age, climate and other non-budworm environmental effects, and then growth losses were computed as a percentage of expected growth (Swetnam 1984). Additional collections were obtained in 1984 in order to expand the scope of the radial growth study. The objectives included 1) assessment of a larger number of tree -ring samples, 2) comparison of radial growth losses between the two primary host species - Douglas-fir (Pseudotsuga menziesii) and white fir (Abies concolor), 3) comparison of radial growth losses between age classes, and 4) analysis of the relationship between yearly measurements of defoliation, insect populations and radial growth. This report summarizes the findings of the above analyses. Increment core samples from the 1982 collections are included here, therefore this report supersedes the earlier report (Swetnam 1984). Information is also presented on observations derived from the dated tree-ring series on the timing of occurrence of known and inferred spruce budworm outbreaks for the past 284 years (1700- 1983). This is the longest record of spruce budworm occurrence yet developed for western North America.
Language:
en_US
Keywords:
Western spruce budworm -- New Mexico -- Carson National Forest -- History.; Douglas fir -- New Mexico -- Carson National Forest -- Growth.; Abies concolor -- New Mexico -- Carson National Forest -- Growth.; Douglas fir -- Losses -- New Mexico -- Carson National Forest.; Abies concolor -- Losses -- New Mexico -- Carson National Forest.; Douglas fir -- New Mexico -- Carson National Forest -- Growth -- Statistics.; Abies concolor -- New Mexico -- Carson National Forest -- Growth -- Statistics.; Douglas fir -- Losses -- New Mexico -- Carson National Forest -- Statistics.; Abies concolor -- Losses -- New Mexico -- Carson National Forest -- Statistics.
Sponsors:
U.S. Forest Service, Southwestern Region Forest Pest Management, and the Canada United States Spruce Budworms research program, Contracts ON 43-8371-3-425, and ON 43-8371-4-628.

Full metadata record

DC FieldValue Language
dc.contributor.authorSwetnam, Thomas W.en_US
dc.date.accessioned2013-10-02T01:38:31Z-
dc.date.available2013-10-02T01:38:31Z-
dc.date.issued1985-10-31-
dc.identifier.urihttp://hdl.handle.net/10150/302602-
dc.descriptionFinal Report / Contract on 43-8371-4-628 / For: USDA, Forest Service, Southwestern Regionen_US
dc.description.abstractRegional outbreaks of western spruce budworms (Choristoneura occidentalis Freeman) have recurred at least three times in northern New Mexico since the early 1920's when the U. S. Forest Service first began systematic forest-pest surveys and documentation (Lessard 1975, U. S. Forest Service documents). The current outbreak was first noticed in a small area on the Taos Indian Reservation in 1974, and since then the defoliated areas have increased in New Mexico and Arizona to more than 370,000 acres of Federal, Indian, State and private lands (Linnane 1984). Losses in timber values can generally be ascribed to radial growth loss, height growth loss, topkilling, reduced regeneration, and mortality (Carlson et al. 1983, Fellin et al. 1983). A damage assessment project was initiated in 1978 and was aimed at obtaining measurements of some of these losses in budworm infested stands on the Carson National Forest, New Mexico (Holland and Lessard 1979). A large data base has subsequently been developed, including yearly measurements on topkilling, mortality, defoliation, and insect population changes (Stein 1980, 1981, Stein and McDonnell 1982, Rogers 1984). A growth assessment study was undertaken in 1982 to determine the feasibility of using dendrochronological methods to identify the timing of past outbreaks and to quantify radial growth losses associated with budworm defoliation (Swetnam 1984). Results of this work showed that three major outbreaks during the twentieth century were clearly visible in the tree-ring samples obtained from currently infested trees. The radial growth of host trees was corrected for age, climate and other non-budworm environmental effects, and then growth losses were computed as a percentage of expected growth (Swetnam 1984). Additional collections were obtained in 1984 in order to expand the scope of the radial growth study. The objectives included 1) assessment of a larger number of tree -ring samples, 2) comparison of radial growth losses between the two primary host species - Douglas-fir (Pseudotsuga menziesii) and white fir (Abies concolor), 3) comparison of radial growth losses between age classes, and 4) analysis of the relationship between yearly measurements of defoliation, insect populations and radial growth. This report summarizes the findings of the above analyses. Increment core samples from the 1982 collections are included here, therefore this report supersedes the earlier report (Swetnam 1984). Information is also presented on observations derived from the dated tree-ring series on the timing of occurrence of known and inferred spruce budworm outbreaks for the past 284 years (1700- 1983). This is the longest record of spruce budworm occurrence yet developed for western North America.en_US
dc.description.sponsorshipU.S. Forest Service, Southwestern Region Forest Pest Management, and the Canada United States Spruce Budworms research program, Contracts ON 43-8371-3-425, and ON 43-8371-4-628.en_US
dc.language.isoen_USen_US
dc.publisherLaboratory of Tree-Ring Research, University of Arizona (Tucson, AZ)en_US
dc.rightsCopyright © Arizona Board of Regents. The University of Arizona.en_US
dc.subjectWestern spruce budworm -- New Mexico -- Carson National Forest -- History.en_US
dc.subjectDouglas fir -- New Mexico -- Carson National Forest -- Growth.en_US
dc.subjectAbies concolor -- New Mexico -- Carson National Forest -- Growth.en_US
dc.subjectDouglas fir -- Losses -- New Mexico -- Carson National Forest.en_US
dc.subjectAbies concolor -- Losses -- New Mexico -- Carson National Forest.en_US
dc.subjectDouglas fir -- New Mexico -- Carson National Forest -- Growth -- Statistics.en_US
dc.subjectAbies concolor -- New Mexico -- Carson National Forest -- Growth -- Statistics.en_US
dc.subjectDouglas fir -- Losses -- New Mexico -- Carson National Forest -- Statistics.en_US
dc.subjectAbies concolor -- Losses -- New Mexico -- Carson National Forest -- Statistics.en_US
dc.titleRadial Growth Losses in Douglas-Fir and White Fir Caused by Western Spruce Budworm in Northern New Mexico: 1700-1983en_US
dc.contributor.departmentLaboratory of Tree-Ring Research, University of Arizonaen_US
dc.description.collectioninformationThis item is part of the Natural History Reports collection. It was digitized from a physical copy provided by the Laboratory of Tree-Ring Research at The University of Arizona. For more information about items in this collection, please contact the Lab's Curator, (520) 621-1608 or see http://ltrr.arizona.edu/collection.en_US
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