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Detection of Leptosphaeria maculans and Leptosphaeria biglobosa Causing Blackleg Disease in Canola from Canadian Canola Seed Lots and Dockage

Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Janitha Wanasundara
Plants 2016, 5(1), 12; https://doi.org/10.3390/plants5010012
Received: 14 January 2016 / Revised: 11 February 2016 / Accepted: 22 February 2016 / Published: 1 March 2016
(This article belongs to the Special Issue Selected/Extended Full Papers of 14th International Rapeseed Congress)
Blackleg, caused by Leptosphaeria maculans, is a major threat to canola production in Canada. With the exception of China, L. maculans is present in areas around the world where cruciferous crops are grown. The pathogen can cause trade barriers in international canola seed export due to its potential risk as a seed contaminant. The most recent example is China restricting canola seeds imported from Canada and Australia in 2009. Therefore, it is important to assess the level of Blackleg infection in Canadian canola seed lots and dockage (seeds and admixture). In this study, canola seed lots and dockage samples collected from Western Canada were tested for the presence of the aggressive L. maculans and the less aggressive L. biglobosa. Results showed that both L. maculans and L. biglobosa were present in seed lots and dockage samples, with L. biglobosa being predominant in infected seeds. Admixture separated from dockage had higher levels of L. maculans and L. biglobosa infection than samples from seed lots. Admixture appears to harbour higher levels of L. maculans infection compared to seeds and is more likely to be a major source of inoculum for the spread of the disease than infected seeds. View Full-Text
Keywords: Blackleg; Leptosphaeria maculans; Leptosphaeria biglobosa; canola; dockage; seed lots; admixture Blackleg; Leptosphaeria maculans; Leptosphaeria biglobosa; canola; dockage; seed lots; admixture
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Fernando, W.G.D.; Zhang, X.; Amarasinghe, C.C. Detection of Leptosphaeria maculans and Leptosphaeria biglobosa Causing Blackleg Disease in Canola from Canadian Canola Seed Lots and Dockage. Plants 2016, 5, 12.

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