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

Crown gall.

PHOTO 157. The occurrence of crown gall on the lower trunk section (just below the graft union) of this fully grown grapevine.

PHOTO 158. Care should be taken not to ascribe the incidence of swollen, coarse graft unions exclusively to crown gall, even though typical galls might be present on the lower trunks of fully grown grapevines – as illustrated here.

106 • A Guide to Grapevine Abnormalities in South Africa