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

Botrytis (grey rot).

PHOTO 76. Favourable climatic conditions present grey rot with ideal opportunities to subject complete bunches to rotting.

PHOTO 77. The cycle of symptomatic expression of grey rot – from partial to total berry browning with the subsequent formation of spores via cracks in the skins – is depicted here.

56 • A Guide to Grapevine Abnormalities in South Africa