Abstract
Clubroot is a soilborne disease caused by Plasmodiophora brassicae that is emerging as a production problem in North Dakota, which contributes approximately 90% of the total U.S. canola production. P. brassicae’s resiliency in the soil and its ability to overcome the genetic resistance available in commercial hybrids make this a significant threat to canola production in the state and highlight the need to identify additional sources of resistance. To this effect, 115 Brassica napus plant introduction accessions were evaluated for their reaction to clubroot in field trials conducted between 2019 and 2021 in a naturally infested field. Seven accessions with high levels of clubroot resistance were identified. These resistant materials may contribute to widening the genetic resistance base of modern canola cultivars.
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