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Outbreak of Blackleg in Canola in North Dakota is Caused by New Pathogenicity Groups

L. E. del Rio Mendoza, A. Nepal, and S. Markell

April 2012


The 2003 discovery of new strains of the fungus Leptosphaeria maculans, the cause of blackleg disease, indicated that the virulence profile of L. maculans populations may be changing in North Dakota canola fields. In 2009, an end-of-season field survey indicated several fields in different parts of the state had unusually high levels of blackleg. Thus, a study was conducted to determine whether the outbreaks were associated with the recently discovered pathotypes.


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