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

Oidium.

PHOTO 24. Darkly coloured scars appear on berries when rubbing off the powdery dust.

PHOTO 25. Scars (Photo 24) on berries of this Shiraz bunch indicate the onset of the development of cracks.

24 • A Guide to Grapevine Abnormalities in South Africa