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

Stem grooving.

PHOTO 211. Typical swelling at the top end of the graft union, with clearly visible lengthwise grooving and pitting on the thicker trunk of the scion component.

PHOTO 212. A further example of obvious grooving and pitting as exposed by bark removal in trunks that are older than a year.

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