Pesticide interactions in the management of onion maggot, Delia antiqua (Meigen) and onion smut, Urocystis cepulae frost, in Ontario

dc.contributor.advisorMcDonald, Mary Ruth
dc.contributor.advisorScott-Dupree, Cynthia
dc.contributor.authorHoepting, Christy Anne
dc.date.accessioned2020-12-03T18:09:17Z
dc.date.available2020-12-03T18:09:17Z
dc.date.copyright2001
dc.degree.departmentDepartment of Environmental Biologyen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractOnion maggot (OM) and onion smut (OS) are economical pests of onions in Ontario. Efficacy and interaction of combinations of insecticides: chlorpyrifos, cyromazine, tebupirimphos+cyfluthrin, and fipronil; and fungicides: carbathiin+thiram, mancozeb and carbathiin+thiram+mancozeb, were evaluated. Fipronil and cyromazine combinations were most effective against OM, but less effective against OS. Chlorpyrifos and tebupirimphos+cyfluthrin combinations were most effective against OS, but less effective against OM. Chlorpyrifos demonstrated static activity against OS. Fipronil provided best season-long OM control. Best control of OM and OS occurred with carbathiin+thiram+mancozeb combinations. An alternative method to chemical control of OS involving the use of germination stimulants by reduction of soil inoculum also was investigated. Soil applications of dipropyl disulphide (DPDS) and onion juice at 60 L/ha and 120L/ha, in 500 L water, respectively, showed a potential for OS management. The information learned from this study may be incorporated into the existing onion Integrated Pest Management program.en_US
dc.identifier.urihttps://hdl.handle.net/10214/21974
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectnnion maggoten_US
dc.subjectonion smuten_US
dc.subjectpesten_US
dc.subjectonionsen_US
dc.subjectinsecticidesen_US
dc.subjectchlorpyrifosen_US
dc.subjectcyromazineen_US
dc.subjecttebupirimphosen_US
dc.subjectcyfluthrinen_US
dc.subjectfipronilen_US
dc.subjectfungicidesen_US
dc.subjectcarbathiinen_US
dc.subjectthiramen_US
dc.subjectmancozeben_US
dc.titlePesticide interactions in the management of onion maggot, Delia antiqua (Meigen) and onion smut, Urocystis cepulae frost, in Ontarioen_US
dc.typeThesisen_US

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