Clubroot in Brassicas: Identification and Management

Dealing with Clubroot (Not Clubfoot) in the Garden

Clubroot (Plasmodiophora brassicae) is a soil-borne pathogen that swells and distorts roots of cabbage, broccoli, cauliflower, and related crops. It persists in soil for years.

Management Strategies

• Crop rotation: Avoid brassicas in infected beds for 5–7 years.
• Raise soil pH to 7.2+ with lime; high pH suppresses spore germination.
• Improve drainage: Clubroot thrives in wet, acidic soils.
• Resistant varieties: Choose clubroot-resistant cultivars when available.
• Soil fumigants (Vapam, K-Pam) have questionable efficacy and are rarely practical for home gardens.

The simplest approach: move susceptible crops to a clean area and lime the old bed heavily.