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water-soaked, sunken brown to black lesions
are observed at the base of stems and on petioles. Discolouration
of tissues inside the stem may also occur.
-
fibrous roots have localized lesions but the entire root
system can be affected, with characteristic black, water-soaked
appearance.
-
storage roots have small, sunken brown lesions with black
margins; more frequently the rotting is internal with no evidence
outside. Affected tissue becomes watery.
-
there is a peculiar smell produced in infected tissues, due to
the invasion of saprophytes that live on decomposed organic matter.
