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Contribution of non-host crops of Plasmodiophora brassicae to clubroot management and inoculum potential Open Access


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University of Alberta
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Xiao, Qiang
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Department of Agricultural, Food and Nutritional Science

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Master of Science
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Clubroot, caused by Plasmodiophora brassicae Woronin, is a major soilborne disease of canola in Alberta. Root exudates from host (Chinese cabbage (Brassica rapa var. pekinensis, cv. Granaat), canola (Brassica rapa L.)) and non-host (perennial ryegrass (Lolium perenne L.)) plants were found to significantly stimulate germination of pathogen resting spores, suggesting that these plants could be used as bait crops to manage clubroot. In greenhouse studies, cropping of B. rapa L. canola and perennial ryegrass significantly reduced clubroot severity in a subsequent B. napus L. canola crop, but more research is needed before bait crops can be recommended for clubroot management. Secondary zoospores produced on ryegrass could infect canola, resulting in disease development and indicating that ryegrass could contribute to P. brassicae inoculum in the soil. The manipulation of seeding dates and cropping of resistant cultivars were also assessed as clubroot management tools and found to reduce the severity of disease. Sustainable management of clubroot of canola will likely require an integrated approach, incorporating various strategies.
License granted by qiang xiao ( on 2011-11-25 (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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