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
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.