# Herbicide drift

- URL: https://backyardgrapes.com/diseases/herbicide-drift/
- Category: Disorder
- Affects: Leaves, Shoots & canes
- Severity: moderate
- Favored by: Spray drift from nearby lawn, pasture, or ditch weed-killing — worst on warm, still, or breezy days; also from herbicide-contaminated sprayers or mulch.
- Easily confused with: Grapevine fanleaf virus, Eutypa dieback

**Summary:** Distorted, cupped, fan-shaped new growth from weed-killer that drifted onto the vine — not a disease at all.

**What to look for:**
- New leaves cupped, crinkled, narrow, or fan-shaped with abnormal vein patterns (classic 2,4-D / dicamba injury).
- Twisted, stunted, or strap-like shoot tips.
- Yellow or bleached new growth (glyphosate) that may show up the following spring.
- Damage worst on the side facing the spray source, and on the youngest growth.

**Treatment — Cultural / prevention:**
- Find and stop the source — a neighbour's or your own weed spraying is the usual culprit.
- Never use a sprayer that has held herbicide to spray anything else; keep a dedicated sprayer.
- Avoid spraying weed-killer near vines on warm or windy days, when drift and vapour move furthest.
- Keep the vine well watered and unstressed; vines often grow out of mild injury over a season or two.
- Watch for contaminated straw/manure mulch (persistent herbicides like aminopyralid) and avoid it.

**Treatment — Organic / low-toxicity:**
- There is no spray that reverses herbicide injury — recovery is about removing the cause and supporting the vine.

Herbicide drift is one of the most common — and most misdiagnosed — problems on
home-garden grapes. Grapes are exquisitely sensitive to growth-regulator weed-killers like
2,4-D and dicamba, and even a tiny dose drifting from a lawn, pasture, or roadside can
twist and cup the new leaves into shapes that look alarmingly like a virus. The tell is the
pattern: injury appears suddenly on the newest growth, is often worst on the side facing
the spray, and lines up in time with someone spraying nearby.

Because it isn't a disease, there's nothing to spray on the vine. The fix is detective work
— find and stop the source — and patience: a vine that gets a light hit usually grows out
of it over a season or two if kept healthy and watered. Two things worth ruling out are a
sprayer that once held herbicide (residue is enough to injure a vine) and hay or manure
mulch carrying persistent herbicides, which can damage vines long after application.

**Image credits:**
- Dicamba and 2,4-D damage to grapevine leaves — [Photo: Pierre Helwi, Purdue University Facts for Fancy Fruit](https://fff.hort.purdue.edu/article/tips-for-preventing-herbicide-injury/)
- Leaf cupping on grapevine caused by improper application of Stinger (growth-regulator herbicide) — [Photo: Rob Crassweller, Penn State Extension Wine & Grapes U.](https://psuwineandgrapes.wordpress.com/2017/07/28/growth-regulator-herbicides-negatively-affect-grapevine-development-identification-of-herbicide-drift-damage-how-to-prevent-it-and-what-to-do-if-it-occurs-in-your-vineyard/)

**Sources:**
- [Field Guide to Vineyard Herbicide Drift](https://extension.psu.edu/field-guide-to-vineyard-herbicide-drift) — Penn State Extension
- [Herbicide Injury to Grapes from 2, 4-D, and Dicamba: Awareness and Prevention](https://psuwineandgrapes.wordpress.com/2018/03/29/herbicide-injury-to-grapes-from-2-4-d-and-dicamba-awareness-and-prevention/) — Penn State Extension Wine & Grapes U.
- [Herbicide damage identification: Vineyards](https://blog-fruit-vegetable-ipm.extension.umn.edu/2026/07/herbicide-damage-identification.html) — University of Minnesota Extension
- [2,4-D Injury on Grape](https://fruitscout.mgcafe.uky.edu/24-d-injury-grape) — University of Kentucky Martin-Gatton College of Agriculture