roots with charcoal rot (G. Lawrence, APS).
of storage root flesh (G. Lawrence, APS).
- 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.
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