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dc.contributor.advisorGillott, Cedricen_US
dc.contributor.advisorErlandson, Martinen_US
dc.creatorGariepy, Tara Dawneen_US
dc.date.accessioned2007-04-13T11:51:25Zen_US
dc.date.accessioned2013-01-04T04:29:03Z
dc.date.available2007-04-24T08:00:00Zen_US
dc.date.available2013-01-04T04:29:03Z
dc.date.created2007-04en_US
dc.date.issued2007-04-24en_US
dc.date.submittedApril 2007en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-04132007-115125en_US
dc.description.abstractLygus Hahn (Hemiptera: Miridae) are serious pests of economically important field, fruit, vegetable, and greenhouse crops in Canada. The release of European Peristenus Förster (Hymenoptera: Braconidae) in the USA has resulted in significant suppression of this pest and has renewed interest in the release of European Peristenus spp. in Canada. Prior to the release of exotic Peristenus spp., ecological host range studies need to be conducted to define their habitat and host associations. These associations can be difficult to study using conventional methods. Morphological similarity of related parasitoids prevents species-level identification by dissection. Host rearing is time-consuming and can result in high levels of host and parasitoid mortality. To facilitate identification of immature Peristenus spp. in their hosts, a multiplex PCR assay was developed. This assay provided a specific and sensitive tool to screen individual insects for three parasitoid species simultaneously. To validate the utility of the multiplex PCR assay in ecological host range studies, parasitism and parasitoid species composition obtained using conventional and molecular techniques were compared. Molecular methods compared favorably with conventional methods; however, more complete species composition information was available with the multiplex assay. To improve the quality of risk assessment studies and extract the most accurate ecological host range data, molecular methods were used to evaluate host-parasitoid associations in mirid populations collected in two ecoregions. Several new host-parasitoid associations were recorded for P. digoneutis and P. relictus, but parasitism of non-target mirids was low. Parasitism of the target host collected from different plant species was evaluated to help clarify Peristenus – host-plant associations. Despite the investigation of three different host plant species, no difference was observed in the parasitism level or parasitoid species composition in L. rugulipennis. The post-release utility of the multiplex assay was investigated in Canada, where Lygus parasitoids may have dispersed following release in the USA. To confirm establishment, samples were analyzed using the multiplex PCR assay, and P. digoneutis was detected for the first time in southern Ontario.en_US
dc.language.isoen_USen_US
dc.subjectmolecular diagnosticsen_US
dc.subjectbiological controlen_US
dc.subjectmultiplex PCRen_US
dc.subjectPeristenusen_US
dc.titleMolecular markers for lygus parasitoids to assess host specificity of candidate entomophagous biological control agentsen_US
thesis.degree.departmentBiologyen_US
thesis.degree.disciplineBiologyen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophy (Ph.D.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberKuhlmann, Ulrichen_US
dc.contributor.committeeMemberDavis, Arthur R.en_US
dc.contributor.committeeMemberMessier, Françoisen_US


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