A Guide to Grapevine Abnormalities in South Africa - P.G. GOUSSARD

Esca-associated soft wood rotting (131); black foot (132).

PHOTO 131. An example of an esca-associated internal rotting pattern which reflects the presence of black specks (which may occassionally occur).

PHOTO 132. Browning/rotting/blockage of vascular tissue as a result of black foot. Note the dead roots which may be indicative of infection originating from the soil.

A Guide to Grapevine Abnormalities in South Africa • 89