Influence of pH, Temperature, and Biofungicides on Clubroot of Canola

dc.contributor.advisorMcDonald, MaryRuth
dc.contributor.advisorGossen, Bruce
dc.contributor.authorKasinathan, Hema
dc.date.accessioned2012-05-02T15:14:15Z
dc.date.available2012-05-02T15:14:15Z
dc.date.copyright2012-04
dc.date.created2012-04-01
dc.date.issued2012-04-01
dc.degree.departmentDepartment of Plant Agricultureen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmePlant Agricultureen_US
dc.description.abstractManagement of clubroot caused by the soil-borne biotrophic plant protist Plasmodiophora brassicae on canola and other Brassica crops is an important challenge to producers. Studies on the interaction of pH and temperature on root hair infection (RHI) and clubroot symptom development in canola roots revealed that high levels of clubroot can occur under optimum temperature, moisture and spore load, even at alkaline pH of 7.5. Clubroot was suppressed at all temperatures at pH 8.0, but not totally eliminated. The occurrence of maximum levels of root hair infection and clubroot development (RHI = 61%, Clubroot incidence (CI) & Disease severity index (DSI) = 100%) at temperatures of 20° and 25°C and pH of 5.0 to 6.5 was confirmed. The efficacy of biofungicides against P. brassicae was influenced by pathogen load, host, growth media and its properties. Drench application of Serenade and Prestop were moderately effective in reducing clubroot levels in canola (Brassica napus L. and B. rapa L.) and to a lesser extent in Shanghai pak choy (B. rapa L. ssp. Chinensis (Rupr.) var. communis Tsen and Lee). The mean clubroot incidence and severity caused by Pathotype 3 was found to be slightly higher than that of Pathotype 6. Clubroot level increased with increase in soil bulk density.en_US
dc.identifier.urihttp://hdl.handle.net/10214/3547
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectCanolaen_US
dc.subjectclubrooten_US
dc.subjecttemperatureen_US
dc.subjectpHen_US
dc.subjectbiofungicidesen_US
dc.subjectsoilen_US
dc.titleInfluence of pH, Temperature, and Biofungicides on Clubroot of Canolaen_US
dc.typeThesisen_US

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