White blister (white rust)
Disease Raised white blisters on the leaves and stems of brassicas and some salad crops.
What to look for
White, raised, chalky blisters on leaves and stems, which can distort growth. Common on rocket, radish, mustard and other brassicas.
When: Summer and autumn, especially in damp weather.
How to prevent it
- Rotate crops and avoid overcrowding.
- Clear debris at the end of the season.
How to deal with it
- Remove affected leaves and bin them.
- Plants usually continue to grow, and the damage is mostly cosmetic.
Crops it affects
If you choose to use any treatment, use only products approved for UK home gardens, follow the label and avoid spraying open flowers. See all pests and diseases.