Clubroot is one of the most destructive diseases of brassicas globally. Although it was detected in Australia as early as the 1890s, Plasmodiophora brassicae, the pathogen that produces clubroot, caused widespread loss during the 1980s and 1990s due to increasing brassica production and use of transplants. Clubroot now affects more than 70% of brassica properties in Victoria, Australia.

Severe infection can cause stunting, poor quality crops and even plant death before harvest.