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

Root formation problems (3); withered shoot growth (4); vascular tissue problems (5).

PHOTO 3. Root development on the one side of the rootstock only means that the wound on the opposite side never heals properly and consequently creates ideal entry channels for harmful secondary organisms. This kind of situation should be resolved before the establishment of one-year-old grafted vines.

PHOTO 4. This young vine clearly shows withered shoot growth combined with yellowing of the canopy shortly after establishment.

PHOTO 5. Complete dieback of the grapevine (Photo 4) indicating that sap flow has been hampered (vascular tissue problems).

A Guide to Grapevine Abnormalities in South Africa • 11