Java black rot

Internal and external views  of storage roots with Java black rot (J. Lo, APS).

Black sunken lesion on storage root (T. Ames).

Diagnostic summary

• What you see on plants

- on storage roots: brown to reddish brown, round sunken lesions with solid black centre surrounded by a soft, pinkish ring of decaying tissue.

- lesions become hard, sunken and completely blackened. 

- infection may start in one or both ends of fleshy root, entire root dries out and mummifies. During drying process, black structures emerge through root periderm and surrounding tissues turn black.

• One of the most significant postharvest diseases.

• Present worldwide.

• Occurs in seedbeds when infected sprouts are used as propagation material.

• Requires warm temperatures (20-30 ^oC) and  does not develop when humidity is too  high.

• Symptoms can be confused with those of black rot and charcoal rot in early stages of infection.

Taxonomy

Economic importance

Geographical distribution

Symptoms

Morphology

Biology and ecology

Host range

Management

References

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