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

Corky bark.

PHOTO 217. Characteristic traits of corky bark are associated with uneven/insufficient lignification in certain shoots of infected grapevines.

PHOTO 218. The tendency of rubbery shoots (as in Photo 217) to assume a crescent-shape and pendulant appearance, is illustrated here. Also note the dark brown, purplish appearance of leaves in infected grapevines that are moreover subject to very late leaf drop. In addition the occurrence of dead, coarse and cracked bark on the trunks is characteristic of corky bark.

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