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

Bacterial blight.

PHOTO 147. A typical example of the developmental pattern of small, lenticular cracks on the shoot on the left, to necrotic cracks and cancers on the shoot on the right.

PHOTO 148. Similar necrotic cracks (compare Photo 147) also occur on peduncles and lateral branches, in which case total dieback sets in – as depicted by the flower cluster (during flowering) on the right.

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