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Clubroot Disease of Canola—Information Update

***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 Infection and  Spread

  • Clubroot is a soil‐borne disease of cruciferous crops and weeds and is caused by Plasmodiophora brassicaea 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.

Alberta Clubroot map

 

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