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dc.contributor.authorSumpter, Kenton Lucasen_US
dc.date.accessioned2017-01-31T09:00:57Z
dc.date.available2017-01-31T09:00:57Z
dc.date.issued2017-01-30en_US
dc.identifier.othervt_gsexam:9231en_US
dc.identifier.urihttp://hdl.handle.net/10919/74873
dc.description.abstractThe insecticide imidacloprid, has been found to be highly effective in suppressing hemlock woolly adelgid, Adelges tsugae. Laricobius nigrinus is a predatory beetle released as a biological control of adelgids in the eastern U.S. This project was designed to develop a pest management strategy that utilizes both tactics concurrently within the same site. It will assess the efficiency of this strategy in reducing HWA populations and improving the health of hemlock forests. The project was started in 2010 and data were collected annually through 2016. The project spanned three sites in three different states (KY, WV, and TN). Results show that tree health has generally declined across all sites for each year. HWA population index values are highly variable and are more strongly influenced by the occurrence of low winter temperatures than by treatment effect. Cross-correlation analysis of tree health and HWA population, revealed characteristics of their temporal relationship. In two of the three sites, tree health lagged up to three years behind changes in HWA population, and HWA populations lagged approximately one year behind changes in tree health. L. nigrinus did not establish at any site as of 2016. The lack of sustained recovery of the beetle may be attributable to the occurrence of extremely cold temperatures during the winters of 2014 and 2015 which produced subsequent crashes in the HWA population at two of the three sites. In TN, the L. nigrinus population may have never established due to a decline in the HWA population shortly after release.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis item is protected by copyright and/or related rights. Some uses of this item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectAdelges tsugaeen_US
dc.subjectLaricobius nigrinusen_US
dc.subjectIPMen_US
dc.subjectforest healthen_US
dc.subjectHWAen_US
dc.subjectimidaclopriden_US
dc.subjectbiological controlen_US
dc.titleEvaluating a Potential Area-wide IPM Strategy for Managing Hemlock Woolly Adelgid in the Eastern United Statesen_US
dc.typeThesisen_US
dc.contributor.departmentEntomologyen_US
dc.description.degreeMaster of Science in Life Sciencesen_US
thesis.degree.nameMaster of Science in Life Sciencesen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEntomologyen_US
dc.contributor.committeechairSalom, Scott M.en_US
dc.contributor.committeechairBrewster, Carlyle C.en_US
dc.contributor.committeememberMayfield, Alberten_US
dc.contributor.committeememberAnderson, Troy D.en_US


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