Determining the threat of Pierce's disease to Virginia vineyards

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dc.contributor.authorWallingford, Anna Kateen
dc.contributor.committeechairPfeiffer, Douglas G.en
dc.contributor.committeememberWolf, Tony K.en
dc.contributor.committeememberKuhar, Thomas P.en
dc.contributor.committeememberWilliams, Jerry Michaelen
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T20:41:49Zen
dc.date.adate2008-12-16en
dc.date.available2014-03-14T20:41:49Zen
dc.date.issued2008-07-10en
dc.date.rdate2008-12-16en
dc.date.sdate2008-07-23en
dc.description.abstractPierce's disease (PD) is a vascular disease of grapevines caused by <i>Xylella fastidiosa</i> (Wells et al.) (<i>Xf</i>) which is transmitted by xylophagous insect vectors. PD infection in Virginia vineyards was thought to be isolated to southeastern portions of the state as there have been no reports of vine loss in western Virginia and cold winter temperatures experienced there limit the effects of the bacterium from year to year. Upward trends in winter temperatures have raised PD concern in the mid-Atlantic. My risk assessment study found PD symptomatic vines beyond the modeled boundary for infection, confirmed <i>Xf</i>-positive with DAS-ELISA. Yellow sticky traps were used to survey Virginia vineyards throughout the 2006 and 2007 growing seasons to identify sharpshooter (Cicadellinae) species in six growing regions. <i>Graphocephala versuta </i>(Say) and <i>Oncometopia orbona</i> (Fabricius) (Hemiptera: Cicadellidae) were trapped in the greatest abundance and were both present in every region surveyed. This study uses geographical representation of climatological data to estimate risk for Pierce's disease.en
dc.description.degreeMaster of Science in Life Sciencesen
dc.identifier.otheretd-07232008-094859en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07232008-094859/en
dc.identifier.urihttp://hdl.handle.net/10919/34123en
dc.publisherVirginia Techen
dc.relation.haspartWallingford.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPierce's diseaseen
dc.subjectXylella fastidiosaen
dc.subjectsharpshootersen
dc.subjectCicadellidaeen
dc.titleDetermining the threat of Pierce's disease to Virginia vineyardsen
dc.typeThesisen
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Science in Life Sciencesen

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