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

Potassium deficiency.

PHOTO 468. A characteristic example of potassium deficiency, reflected by the downward curling of leaf edges. This situation is usually associated with yellowing and gradual browning and withering of tissue.

PHOTO 469. Later in the season potassium deficiencies are associated with browning and withering of older leaf edges especially.

A Guide to Grapevine Abnormalities in South Africa • 301