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Epidemiology and Management of Stemphylium Leaf Blight on Onion (Allium Cepa L.) in The Holland Marsh, Ontario

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dc.contributor.advisor McDonald, Mary Ruth
dc.contributor.author Tayviah, Cyril Selasi
dc.date.accessioned 2017-05-09T14:59:49Z
dc.date.available 2017-05-09T14:59:49Z
dc.date.copyright 2017-04
dc.date.created 2017-04-18
dc.date.issued 2017-05-09
dc.identifier.uri http://hdl.handle.net/10214/10430
dc.description.abstract Stemphylium leaf blight (SLB), caused by Stemphylium vesicarium Wallr (Simmons) (teleomorph: Pleospora allii. (Rabenh.) Ces. & De Not), is a destructive disease of onion. The objective of this study was to assess the epidemiology of SLB in Ontario and evaluate management strategies. Stemphylium leaf blight first appeared at the end of June to mid-July in 2015 and 2016, coinciding with air-borne conidia of S. vesicarium (based on spore trapping), frequent rainfall, and air temperatures ≥ 15 °C. Onion cultivars Pontiac, Milestone and Hendrix were slightly less susceptible to SLB compared to the other commercial cultivars in the study. A protective application of fluopyram plus pyrimethanil at the 3 4 leaf stage reduced SLB incidence, but later applications had little impact. Aerial infrared photography demonstrated the potential to identify differences in onion plots, but these differences were not related to SLB. Additional research is needed to evaluate more fungicides and spray-timings for SLB management. en_US
dc.description.sponsorship The Ontario Ministry of Agriculture, Food and Rural Affairs/Univ. of Guelph Partnership, the Bradford Cooperative Storage and the Fresh Vegetable Growers of Ontario through Growing Forward 2. en_US
dc.language.iso en en_US
dc.subject stemphylium leaf blight en_US
dc.subject Stemphylium vesicarium en_US
dc.subject pseudothecia en_US
dc.subject Holland Marsh en_US
dc.title Epidemiology and Management of Stemphylium Leaf Blight on Onion (Allium Cepa L.) in The Holland Marsh, Ontario en_US
dc.type Thesis en_US
dc.degree.programme Plant Agriculture en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Plant Agriculture en_US
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