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

Tendril associated strangulation (536); yellowing of shaded leaves (537).

PHOTO 536. Another example of severe strangulation effects that may be caused by tendrils, thereby contributing to phenomena whereby normal sap flow may be compromised.

PHOTO 537. Yellowing of shaded leaves can/may occur in dense canopies.

344 • A Guide to Grapevine Abnormalities in South Africa