Brown rot
Ralstonia solanacearum
Symptoms
- Stained eyes (slime and soil)
- Early stage: brown discolouration of vascular bundle ring
- Later stage: typical grey-white ‘pearls’ on the vascular bundle ring that appear spontaneously if tuber is sliced
- Sometimes only latent (no symptoms)
- Secondary infections can cause tuber rot
Infection and spread
- A notifiable, quarantine disease
- Infection via seed tubers and volunteer potato plants
- For some strains survival in soil is possible. The strains occurring in Europe cannot survive in the soil at lower temperatures
- Can be spread via irrigation water if watercourses become infected
- Can develop on the roots of woody nightshade
- Bacterial slime from roots, eyes and via soil
- Bacteria rapidly spread to all parts of the plant
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- Tuber Symptoms
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