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

Lightning (437); sulphur burn (438).

PHOTO 437. The drying out of pith sections of shoots damaged by lightning, thereby creating the impression that they are hollow inside, is considered very characteristic of this phenomenon.

PHOTO 438. In reaction to sulphur burn in high temperature situations shortly after dusting, young leaves burn mostly from the edges, whereafter they undergo a typical reddish-brown discolouration followed by the curling up and hardening/drying out of damaged parts.

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