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

Sour rot (89); botrytis-/sour rot (90).

PHOTO 89. Characteristic yellow-brown to almost orange skin discolourations occur at the top end of this bunch while the bottom section reflects the arrest of grey rot due to unfavourable conditions.

PHOTO 90. An example where botrytis rot (despite an advanced stage of development) had to succumb, during warm, dry conditions, to the situation where sour rot got the better of the situation.

64 • A Guide to Grapevine Abnormalities in South Africa