Journal
CANADIAN JOURNAL OF PLANT SCIENCE
Volume -, Issue -, Pages -Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/CJPS-2022-0086
Keywords
canola; clubroot; Plasmodiophora brassicae; soil fumigation
Categories
Funding
- Clubroot Risk Mitigation Initiative and Growing Forward 2 Program - Canola Council of Canada, Agriculture and Agri-Food Canada [2013-3.3]
- Alberta Crop Industry Development Fund
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Clubroot, a damaging disease of canola caused by Plasmodiophora brassicae, can be effectively managed using the soil fumigant Vapam. Replicated experiments showed significant reductions in clubroot severity following treatment with Vapam, and there were residual effects observed in the year following treatment.
Clubroot, a damaging disease of canola (Brassica napus L.) caused by the soilborne parasite Plasmodiophora brassicae Woronin, is spreading across Alberta and other provinces of western Canada. The movement of infested soil on field machinery is the main mechanism of dispersal, with clubroot generally occurring first as localized patches near field entrances. In this study, the soil fumigant Vapam (metam sodium) was evaluated as a management option for foci of P. brassicae infestation. Replicated experiments at two field sites in central Alberta showed reductions in clubroot severity ranging from 9% to 51% following treatment with varying rates of Vapam. Decreases in clubroot severity of up to 28% were observed in the year following Vapam treatment, indicating some potential residual effects and (or) a reduction in the amount of inoculum returned to the soil in the previous year. While Vapam shows some promise as a clubroot management tool, an integrated approach will be required for the sustainable management of this disease on canola.
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