***Information has been adapted from multiple sources*** Strelkov et al., 2013. The Occurrence of Clubroot on Canola in Alberta in 2014. Internet: www.2020seedlabs.ca Accessed: October, 2017 Special thank you to Blake Gaugler from Northern Lights County
Additional Sources of Information
- Clubroot Disease of Mustard and Canola - Source: Agdex 140/638-1. Revised September 2015. http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex8593
- Alberta Clubroot Management Plan - Source: Agdex 140//638-2. Revised August 2014. http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/all/agdex11519
- Canadian Association of Petrolium Producers Clubroot Disease Management Best Management Practices http://www.capp.ca/publications-and-statistics/publications/139848
- Agriculture and Agri-Food Canada Clubroot of Crucifers http://publications.gc.ca/collections/Collection/A42-85-1999E.pdf
- Manitoba Agriculture - Clubroot of Brassica Crops https://www.gov.mb.ca/agriculture/crops/plant-diseases/clubroot-brassica.html
- Canadian Journal of Plant Pathology - Clubroot of cruciferous crops – new perspectives on an old disease http://www.tandfonline.com/doi/abs/10.1080/07060661003621761?src=recsys&journalCode=tcjp20
Clubroot Infection and Spread
- Clubroot is a soil‐borne disease of cruciferous crops and weeds and is caused by Plasmodiophora brassicae, a protist pathogen that induces gall formation on infected roots of susceptible plants
- Infections occur when exudates from roots of host plants trigger germination of resting spores in the soil,producing zoospores.They swim in soil water to root hairs that they infect to start the formation of the root galls.
- The disease is favoured by warm soil(20‐24ºC), high soil moisture and low soil pH(<6.5) but can still develop outside these optimum conditions.
- Clubroot is mainly spread through movement of soil containing the long‐lived resting spores that are released into the soil when the galls
- To estimate yield loss due to clubroot, take the percentage of infected plants in a field and divide by two (recognizing that losses>50% can occur from extreme infestations) For example, if 50% of the plants are infected, a 25% yield loss would be estimated.