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

Black foot.

PHOTO 6. Longitudinal sections of the base (feet) of grapevines (Photos 4 & 5) reveal unmistakable signs of discolouration, rotting and blocking of the xylem. Note the condition of the roots. Laboratory investigations confirmed the role played by black foot.

PHOTO 7. A typical example of black foot, browning from the bark section of this rootstock.

12 • A Guide to Grapevine Abnormalities in South Africa