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

Paraquat (488); 2,4-D phytotoxicity (489).

PHOTO 488. A slightly unusual example where paraquat is taken up by mechanically damaged shoots and translocated to leaves, thereby contributing to browning/necrosis of the veinal network and adjacent tissue.

PHOTO 489. Phytotoxicity interventions in this ‘Gloryvine’ grapevine as a result of the application of herbicide (2,4-D as active ingredient) during bud swell.

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