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

Bacterial blight.

PHOTO 145. Characteristic elongation, enlargement and distribution of the initial lenticular cracks (as in Photo 144) on one side of this young shoot. Also note that it appears on the petiole on the right.

PHOTO 146. The development of necrotic cracks and cancers across entire shoot halves, from cracks that were initially lenticular (Photos 144 & 145), is considered very characistic of bacterial blight.

98 • A Guide to Grapevine Abnormalities in South Africa