Clubroot (Plasmodiophora bassicae) is an old and serious disease of cole crops. Once your soil becomes infested, it may take 10 years or more to eliminate the source of infection. The disease is not seed-borne. But the fungus is readily spread in surface runoff water, irrigation water, contaminated equipment, and to some extent by roving animals. The use of contaminated transplants is the chief means of spread of the causal agent.
The publication "Cole crops disorder: Clubroot" describes the disease and control measures.
Try growing other vegetables not susceptible to clubroot until your soil is free of this disease.

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