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Analysis of three biological control agents and naturally-occurring fungal colonizers on the survival of sclerotia of Botrytis squamosa, Sclerotinia sclerotiorum and Sclerotium cepivorum

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dc.contributor.advisor Boland, Greg J.
dc.contributor.advisor McDonald, Mary Ruth
dc.contributor.author Barbison, Laura C.
dc.date.accessioned 2014-02-18T15:52:57Z
dc.date.available 2014-02-18T15:52:57Z
dc.date.copyright 2014
dc.date.created 2014-01-29
dc.date.issued 2014-02-18
dc.identifier.uri http://hdl.handle.net/10214/7860
dc.description.abstract Management of sclerotia-forming phytopathogenic fungi is difficult due to the resilience of their sclerotia within soil. This thesis assessed the efficacy of three biological control agents (BCAs), Coniothyrium minitans, Microsphaeropsis ochracea, and Trichoderma atroviride, on laboratory-produced (LP) sclerotia of Botrytis squamosa, Sclerotinia sclerotiorum and Sclerotium cepivorum under field conditions for 20 months. Trichoderma atroviride was most consistent, reducing survival of B. squamosa and S. sclerotiorum to 19 and 23%. S. cepivorum did not vary. Further investigations compared the survivability of LP and field-produced (FP) sclerotia of S. sclerotiorum. Survival of LP sclerotia of S. sclerotiorum was greater than that of FP, which were heavily colonized with other fungi. Colonizers were isolated, identified, and evaluated for antagonistic and pathogenic abilities. 80% of isolates demonstrated antagonistism, and two isolates demonstrated pathogenicity. It is evident that sclerotia are not sterile propagules, and that antagonistic soil-dwelling microorganisms are important influential factors on sclerotial survival. en_US
dc.language.iso en en_US
dc.rights Attribution-NoDerivs 2.5 Canada *
dc.rights.uri http://creativecommons.org/licenses/by-nd/2.5/ca/ *
dc.subject Biocontrol en_US
dc.subject Sclerotia en_US
dc.subject Sclerotinia sclerotiorum en_US
dc.subject Sclerotium cepivorum en_US
dc.subject Botrytis squamosa en_US
dc.title Analysis of three biological control agents and naturally-occurring fungal colonizers on the survival of sclerotia of Botrytis squamosa, Sclerotinia sclerotiorum and Sclerotium cepivorum en_US
dc.type Thesis en_US
dc.degree.programme Environmental Sciences en_US
dc.degree.name Master of Science en_US
dc.degree.department School of Environmental Sciences en_US
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Attribution-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NoDerivs 2.5 Canada