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

Downy mildew.

PHOTO 49. A bunch of table grapes which has succumbed almost entirely to downy mildew at an advanced berry growth stage.

PHOTO 50. This bunch was entirely destroyed by downy mildew. Note the typical purplish colouration. Not to be confused with sunburn or sour rot.

38 • A Guide to Grapevine Abnormalities in South Africa