White rust (Albugo candida)
It affects every known cruciferous crop. However, this disease is generally less common on cabbage, Brussels sprouts, broccoli and cauliflower than on radish, horseradish, mustard and turnip. Leaves have chlorotic or necrotic spots on their upper surface. Pustules form on the lower side of the leaves, small stems and floral parts.
- Clean up crop refuse and destroy cruciferous weeds.
- Crop rotation of at least 3 years can help reduce the disease.