Clubroot of Crucifers

What Is It? | Facts in Depth | For the Professional Diagnostician

Ashlina Chin & Sally A. Miller

Clubroot is a common disease of cruciferous plants and weeds.  The causal agent of this disease is a soilborne slime mold Plasmodiophora brassicae.  This pathogen can survive in soil for many years.  When a susceptible host is present, spores germinate and penetrate the growing plant roots.  The roots become malformed and swollen, forming galls.  Due to this swelling, the host has a difficult time taking up water, which leads to extreme wilting and eventual death.  Managing this disease consists of planting in a well-drained soil that has a pH of 7 or above.

Scientific Name

  • Plasmodiophora brassicae

Host Crops

  • Cabbage
  • Cauliflower
  • Brussels Sprouts
  • Broccoli
  • Chinese Cabbage
  • Turnips
  • Radishes

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