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Effects of Defoliation by the Western False Hemlock Looper on Douglas-Fir Tree-Ring Chronologies

dc.contributor.authorAlfaro, R. I.
dc.contributor.authorMacDonald, R. N.
dc.date.accessioned2012-12-12T22:55:58Z
dc.date.available2012-12-12T22:55:58Z
dc.date.issued1988
dc.identifier.citationAlfaro, R.I., MacDonald, R.N. 1988. Effects of defoliation by the western false hemlock looper on Douglas-fir tree-ring chronologies. Tree-Ring Bulletin 48:3-11.en_US
dc.identifier.issn0041-2198
dc.identifier.urihttp://hdl.handle.net/10150/261809
dc.description.abstractAnnual rings of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, which sustained 1 year of defoliation by the western false hemlock looper, Nepytia freemanii Munroe (Lepidoptera: Geometridae), showed a period of decrease in breast height ring width starting in the year that followed the damage. The magnitude of the decrease was related to the degree of defoliation: there was no ring width decrease on trees that were 0-10% defoliated; the decrease became progressively more noticeable in trees which sustained increasingly higher defoliation; and it was maximum in trees which sustained 91-100% defoliation. This period of reduction lasted 1 to 5 years and was followed by a period of above-normal growth which was related to defoliation in a similar manner: it was absent in trees 0-10% defoliated and maximum in the 91-100% tree defoliation class. Increase in defoliation caused a significant increase in index standard deviation, autocorrelation and mean sensitivity.
dc.language.isoen_USen_US
dc.publisherTree-Ring Societyen_US
dc.relation.urlhttp://www.treeringsociety.orgen_US
dc.rightsCopyright © Tree-Ring Society. All rights reserved.en_US
dc.subjectDendrochronologyen_US
dc.subjectTree Ringsen_US
dc.subjectAgricultural Entomologyen_US
dc.subjectDamageen_US
dc.subjectDefoliationen_US
dc.subjectForest Pestsen_US
dc.subjectForest Treesen_US
dc.subjectIncrementen_US
dc.subjectInsect Pestsen_US
dc.subjectTreesen_US
dc.subjectWoody Plantsen_US
dc.subjectYield Lossesen_US
dc.titleEffects of Defoliation by the Western False Hemlock Looper on Douglas-Fir Tree-Ring Chronologiesen_US
dc.typeArticleen_US
dc.contributor.departmentForestry Canada, Pacific Forestry Centre, Victoria, British Columbiaen_US
dc.contributor.departmentDepartment of Computer Science, University of Victoria, Victoria, British Columbiaen_US
dc.identifier.journalTree-Ring Bulletinen_US
dc.description.collectioninformationThis item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at editor@treeringsociety.org.en_US
refterms.dateFOA2018-08-26T23:00:13Z
html.description.abstractAnnual rings of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, which sustained 1 year of defoliation by the western false hemlock looper, Nepytia freemanii Munroe (Lepidoptera: Geometridae), showed a period of decrease in breast height ring width starting in the year that followed the damage. The magnitude of the decrease was related to the degree of defoliation: there was no ring width decrease on trees that were 0-10% defoliated; the decrease became progressively more noticeable in trees which sustained increasingly higher defoliation; and it was maximum in trees which sustained 91-100% defoliation. This period of reduction lasted 1 to 5 years and was followed by a period of above-normal growth which was related to defoliation in a similar manner: it was absent in trees 0-10% defoliated and maximum in the 91-100% tree defoliation class. Increase in defoliation caused a significant increase in index standard deviation, autocorrelation and mean sensitivity.


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