Biological implications of field-evolved Cry1F resistance and pheromone race in European corn borer, Ostrinia nubilalis Hübner

dc.contributor.advisorHallett, Rebecca
dc.contributor.advisorSmith, Jocelyn
dc.contributor.authorGlasgow, Emily of Environmental Sciencesen_US of Guelphen of Scienceen_US Sciencesen_US
dc.description.abstractEuropean corn borer, Ostrinia nubilalis Hübner, is a major corn pest in North America. Ostrinia nubilalis is managed using transgenic corn (Zea mays L.) producing insecticidal toxins from Bacillus thuringiensis Berliner (Bt). Field-evolved resistance to the Cry1F toxin was first discovered in Nova Scotia, Canada, in 2018. Since Bt corn hybrids have successfully managed O. nubilalis for more than 20 years, most available life history information is outdated. The objectives of this thesis were to determine pheromone race of O. nubilalis across Canada, fitness of Cry1F-resistant O. nubilalis, and inheritance of Cry1F resistance. Ostrinia nubilalis across Canada, including Cry1F-resistant strains, are primarily Z-race, indicating mitigation strategies can be focused on corn. No fitness costs were observed in the Cry1F-resistant strain, so Cry1F resistance is likely to persist in the absence of Cry1F. Field-evolved Cry1F-resistance is autosomal recessive, so the high-dose/refuge strategy did not fail due to Cry1F resistance inheritance pattern.en_US
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada
dc.description.sponsorshipOntario Ministry of Agriculture, Food, and Rural Affairs
dc.description.sponsorshipPioneer Hi-Bred Canada
dc.description.sponsorshipManitoba Crop Alliance
dc.description.sponsorshipGrain Farmers of Ontario
dc.description.sponsorshipManitoba Agriculture and Resource Development
dc.description.sponsorshipBayer Crop Science
dc.description.sponsorshipCentre de Recherche sur les Grains
dc.description.sponsorshipAtlantic Grains Council
dc.description.sponsorshipSyngenta Canada
dc.publisherUniversity of Guelphen
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectOstrinia nubilalisen_US
dc.subjectBacillus thuringiensisen_US
dc.subjectResistance managementen_US
dc.subjectGenetic crossesen_US
dc.subjectPheromone raceen_US
dc.titleBiological implications of field-evolved Cry1F resistance and pheromone race in European corn borer, Ostrinia nubilalis Hübneren_US


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