Identification symptoms
- The conspicuous symptom is a typical wilt,
beginning with a yellowing and stunting of the plant, followed by wilting
and rolling of the leaves as if the roots were unable to supply sufficient
water.
- Finally, the plant dies.
- If a diseased stem is split lengthwise, the
vascular bundles appear as dark streaks.
- When severely infected, nearly the whole stem
is blackend.