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

Drought (417); drowning (418).

PHOTO 417. An example of leaf yellowing, derived from a sudden and complete interruption in the water supply chain, is illustrated by these Pinotage grapevines in the Klein Karoo that are practically ready to be harvested (Oudtshoorn area).

PHOTO 418. Leaf yellowing and eventual desiccation are typical of drowning induced water deficits during the growing season. Prolific weeds are a further indication of this phenomenon, as can be seen in this example.

266 • A Guide to Grapevine Abnormalities in South Africa