Multiple stresses by insect and plant-competition on growth and productivity of Canada thistle

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dc.contributor.authorAng, Ban-Naen
dc.contributor.committeechairKok, Loke T.en
dc.contributor.committeememberFell, Richard D.en
dc.contributor.committeememberHoltzman, Golde I.en
dc.contributor.committeememberPfeiffer, Douglas G.en
dc.contributor.committeememberPienkowski, Robert L.en
dc.contributor.committeememberWolf, Dale D.en
dc.contributor.departmentEntomologyen
dc.coverage.countryCanadaen
dc.date.accessioned2014-03-14T21:21:16Zen
dc.date.adate2005-10-14en
dc.date.available2014-03-14T21:21:16Zen
dc.date.issued1992-08-04en
dc.date.rdate2005-10-14en
dc.date.sdate2005-10-14en
dc.description.abstractCanada thistle is an aggressive perennial weed throughout temperate areas for both the northern and southern hemisphere. As various single tactics have shown limited success in controlling this weed, I believe that a combination of different stress factors is necessary for effective sustainable control of Canada thistle. This study evaluates the competitive abilities of tall fescue grass and crownvetch in conjunction with a thistle feeding insect for Canada thistle control. The goal of the study was to determine what levels of the herbivore and plant competition are needed to suppress Canada thistle. Field studies were conducted to determine the effects of multiple stresses caused by defoliation and plant competition on growth and survival of Canada thistle (<i>Cirsium arvense</i> Scop.). Plant competition was from a cornbination of tall fescue (<i>Festuca arundinaceae</i> Schreb.) and crownvetch (<i>Coronilla varia</i> L). Artificial defoliation was used to determine the influence of level and frequency of defoliation in combination with plant competition on Canada thistle. The effects of various densities of a defoliator, <i>Cassida rubiginosa</i> (Coleop:Chrysonlelidae), in the presence and absence of plant competition were also determined. A three-season study determined the combined effects of <i>C. rubiginosa</i> and plant competitors at various densities on the growth and productivity of Canada thistle plantings of various ages.en
dc.description.degreePh. D.en
dc.format.extentxiv, 154 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10142005-103118en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10142005-103118/en
dc.identifier.urihttp://hdl.handle.net/10919/39886en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1992.A534.pdfen
dc.relation.isformatofOCLC# 26812950en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1992.A534en
dc.subject.lcshCanada thistleen
dc.subject.lcshPlant competitionen
dc.subject.lcshThistles -- Growthen
dc.subject.lcshThistles -- Insect resistanceen
dc.titleMultiple stresses by insect and plant-competition on growth and productivity of Canada thistleen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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