Herbicide spray drift is an occasional problem in vineyards..
For the vineyard pictured here the product Metsulphuron (tradenames Ally, Aim, Brush-off) is alleged to have drifted into a vineyard from a neighbouring property four weeks before the pictures were taken (early spring). A week after application the first symptoms were seen.
Herbicide drift shows as the ‘hormone’ shape, cupping and stunting of leaves (above and below) poor flowering and damage to the vine growing tips.
Disappointingly, herbicide spray drift is an ongoing issue in vineyards, and this is a timely reminder.
PIC: Spray drift affected vineyard. Poor shoot growth in spring.