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

Bunch stem necrosis (443); growth arrestment (444).

PHOTO 443. An enlarged example of the situation seen in Photo 442. Note the typical band formation at the basal origin of the lateral branch in question, as well as in the pedicel in the 09:00 position.

PHOTO 444. Typical of GAP is where flower clusters are choked off and dry out after the appearance of superficial, black lesions on the developing peduncles. Normally reduced shoot growth and shiny, dark green leaves will also be observed in affected grapevines.

A Guide to Grapevine Abnormalities in South Africa • 281