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

Downy mildew.

PHOTO 47. Very typical wrinkling and shrivelling of berries in reaction to downy mildew infection. This situation is usually followed by the berries’ drying out.

PHOTO 48. A typical example of berries which have come into contact with downy mildew at a fairly advanced stage. Note the brown discolouration, which later becomes black.

A Guide to Grapevine Abnormalities in South Africa • 37