Plant parts affected

leaf

Initial diagnosis:

The infection of the foliage results in yellow ‘V’ shaped spots arising along the margin which extend in the direction of the midrib.

Symptoms:

The spots on the leaf are associated with a typical black discoloration of the veins. The infection extends through the xylem to the stalk and the vascular bundles turn black.

Damage type:

The whole leaf shows discoloration and eventually falls off.