A Guide to Grapevine Abnormalities in South Africa - P.G. GOUSSARD
Lightning.
PHOTO 435. Very characteristic of lightning damage are instances where young, soft shoots come into direct contact with wires early in the growing season; these subsequently snap off and dry out, so too flower clusters in an adjacent position.
PHOTO 436. In contrast with the example in Photo 435, thickening occurs in positions of direct wire contact with older, partially lignified shoots – a phenomenon associated with the healing/filling of cracks by means of callus formation.
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