Charcoal rot

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Causal organism: Macrophomina phaseolina (Tassi) Goid. (teleomorph)

Other name: Ashy rot


 Storage roots with charcoal rot (G. Lawrence, APS).


Blackening of storage root flesh (G. Lawrence, APS).

Diagnostic summary

  • What you see on plants

- storage roots dry up, become spongy and  hard, but the periderm remains intact over the decayed tissue.

- two zones can be differentiated from a cross section of an infected root: the outer zone which is black due to presence of mature sclerotia, and the inner zone where the tissue is reddish brown and is in the process of decaying.

- stem may sometimes show lesions at the soil line, especially during heat stress.

  • Fungus is widespread in tropical and subtropical regions of the world.

  • Severe at high temperatures (35 -39C) and high moisture.


Economic importance

Geographical distribution



Biology and ecology

Host range






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