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

Leafroll.

PHOTO 200. A typical example of a white grape cultivar where the retention of green-coloured primary and secondary veins – including a narrow strip of surrounding tissue which remains green – is caused by leafroll.

PHOTO 201. The intense expression of typical leaf characteristics as a result of leafroll in these three Sémillon (red) grapevines – a spontaneous colour mutation of Sémillon (white).

132 • A Guide to Grapevine Abnormalities in South Africa