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

Leafroll.

PHOTO 198. Intense curling of leaf edges creates the impression of smaller leaves, while chlorophyll entrenchment is caused by reddening of leaf tissue. The photosynthetic capacity is obviously seriously compromised in such instances.

PHOTO 199. Severe downward curling of leaf edges accompanied by intravenous yellowing of leaf tissue and green-coloured primary and secondary veins in Sémillon.

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