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

Oidium.

PHOTO 22. A bunch of Chenin blanc displays typical coverage of practically all the berries with a white powderiness. At this stage it is already impossible to “doctor” or save the bunch – even if one uses the best and most expensive fungicides.

PHOTO 23. Apart from the white powderiness, bigger berries often display a brown (sometimes black) corkiness on the surface. This is not to be confused with sulphur burn or thrip damage.

A Guide to Grapevine Abnormalities in South Africa • 23