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

Oidium.

PHOTO 20. Oidium spots on shoots are retained with lignification and are therefore easily observed on cane parts.

PHOTO 21. A typical example of small, green berries being covered in a white powderiness. Note that some of the berries have already turned brown/black and are on the verge of dropping.

22 • A Guide to Grapevine Abnormalities in South Africa