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

Dead-arm.

PHOTO 56. Total or partial die-back of shoots may occur as a result of severe dead-arm infection when conducive conditions prevail until late in the season.

PHOTO 57. The occurrence of lesions (similar to those on shoots) on peduncles and other parts of the bunch framework. In reaction young berries may blacken and shrivel, as seen in this photo. Not to be confused with bacterial blight.

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