Circular lesion with defined margin on storage root ( W. Martin, APS).

Circular spot lesions after a period of storage, dried and sunken and cracked from the centre out (C. Clark, APS).

Diagnostic summary

• What you see on plants

- on storage roots at harvest, shallow round lesions of soft wet texture with well-defined margin, generally 1-2 cm in diameter.

- in storage, lesions usually do not grow, but dry up, and may crack open or peel away from the root.

- storage root shape is not deformed by the lesion.

- affected roots have a bitter flavour.

• Favours hot wet weather conditions.

Taxonomy

Economic importance

Geographical distribution

Symptoms

Morphology

Biology and ecology

Host range

Inspection and diagnosis

Management

References

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