C-DRONE GUIDE · 16 JUNE 2026
Drones in viticulture: mapping the vigour of your vines
Vineyards are the French crop where drones deliver the most value per hectare: fragmented plots, strong within-plot variability, slopes inaccessible to machinery, and an end product whose price justifies precision. Vigour mapping, disease-outbreak spotting, selective harvesting, and now derogated spraying on steep slopes: here is what drones concretely change in the vineyard, vintage by vintage.
Vigour, the wine-grower's master variable
In viticulture, vigour — the vine's vegetative growth — is neither good nor bad in itself: it must be matched to the production goal. Too much vigour gives diluted berries, a humid microclimate that favours disease, and trimming costs; too little signals exhausted soil, an ill-suited rootstock, a deficiency or water stress that threaten the vine's future. And vigour varies enormously within a single plot: soil veins, old manure spots, compaction zones, top and bottom of the slope. That heterogeneity is what a drone vigour map reveals in a single flight.
The vineyard's specificity is row cultivation: a raw aerial image mixes vegetation pixels with inter-row pixels (bare or grassed soil), completely skewing the computed indices. Serious providers therefore apply a dedicated viticultural workflow that isolates row pixels before computing per-vine vigour. That is the technical point to check before ordering — a generic "agricultural NDVI" map designed for wheat is worthless on vines. For the fundamentals of multispectral imaging itself, our guide to drones in precision agriculture explains what the sensors see; here we stick to what is vine-specific.
The flight calendar through the vintage
A vineyard drone flight only makes sense at the right phenological stage. The typical vintage calendar:
| Period | Stage | Flight objective |
|---|---|---|
| March–April | Budburst | Counting missing or dead vines, planning replanting |
| Late May–June | Flowering–fruit set | First vigour map: adjust fertilisation and soil work |
| July | Bunch closure | Water-stress map (thermal), irrigation steering where permitted |
| August | Véraison | Reference vigour map: zoning for selective harvest |
| September | Ripeness | Zone-by-zone harvest date adjustment, plot-level sorting |
The two flights with the best payback are June's — it steers the current year's decisions — and véraison's, which enables selective harvesting: picking homogeneous-vigour zones separately is the difference between one average cuvée and two well-defined ones, including a premium. Many estates start with that single August flight, then extend the programme once the maps have proven themselves. The spring count, meanwhile, is the easiest to justify: knowing your real missing-vine rate (often underestimated by half) turns the replanting budget into a numbers-based decision.
Mildew and flavescence dorée: spotting outbreaks earlier
The drone does not replace plot-level scouting, but it changes the scale of disease surveillance. For downy mildew, repeated aerial imaging highlights the defoliation and abnormal vigour-loss zones that betray established outbreaks — and above all it maps them exhaustively: on a 40 ha estate split into twenty plots, nobody walks every row every week — the drone does. Suspect zones detected from above then steer the field rounds, where visual diagnosis remains sovereign.
For flavescence dorée, a quarantine disease with mandatory surveying in many wine regions, operational work uses high-resolution late-summer drone imagery: affected vines show characteristic leaf reddening or yellowing depending on the variety, detectable on the images and mapped vine by vine. The gain is not to abolish collective surveying — confirmation remains visual and grubbing-up is regulated — but to prioritise it: teams go first where the imagery flagged candidates, raising the detection rate at constant effort. In mandatory-control areas, some grower groups now pool a late-summer flight over the whole appellation: a few euros per hectare that protect the entire vineyard against mass grubbing-up.
Steep slopes: drone spraying becomes legal
This is the big current change for hillside vineyards. Aerial spraying remains prohibited in principle in France, but law no. 2025-365 of 23 April 2025 opened a supervised derogation, whose implementing texts published in spring 2026 define the perimeter: drones may spray on plots with a slope of 20% or more (as well as banana plantations and rootstock mother vines), only with biocontrol products, products authorised in organic farming or classified low-risk, and under strict operating conditions.
For steep-slope vineyards — Côte-Rôtie, Banyuls, Loire or Alsace hillsides, mountain vineyards — the stakes go beyond agronomy: it is operator safety. Winch work and backpack spraying on 40% slopes are among the most accident-prone tasks in French agriculture, and tracked carriers overturn there. The spraying drone removes human exposure, treats 1 to 3 ha per hour depending on the plot, and its flight precision limits drift. Observed prices run between €20 and €60 per hectare per pass depending on slope, access and product — to be weighed against the full cost (time, hardship, risk) of manual treatment on a gradient. Beware: the derogation covers neither flat plots nor conventional synthetic products; any provider offering more is operating outside the law.
Per-hectare prices and estate-level payback
Observed 2026 ranges for vineyard drone services:
| Service | Indicative price |
|---|---|
| Multispectral vigour map (one flight, row-by-row processing) | €75 – €250/ha, tapering with area |
| Three-flight vintage programme | €150 – €400/ha depending on area |
| Missing-vine count | €40 – €90/ha |
| Late-summer disease flight (flavescence, outbreaks) | €30 – €80/ha in pooled campaigns |
| Derogated spraying on slopes ≥ 20% | €20 – €60/ha per pass |
Payback comes quickly on premium products: a selective harvest that shifts 15% of a generic cuvée's volume into a better-priced single-plot cuvée repays several years of mapping. On steep vineyards the arithmetic is even more direct: every avoided hour of backpack spraying is one less cost and one less risk. The right reflex before signing: require vineyard-specific image processing, maps delivered in a format your equipment or adviser can use (shapefile, GeoTIFF, not a mere PDF), and a declared, insured operator — the requirements are the same as for any agricultural drone service.
Wine-growers' frequently asked questions
Can a drone spray my vines? Only under the derogation: plots with slopes ≥ 20% (or rootstock mother vines), biocontrol products, organic-authorised or low-risk products, and a provider meeting the conditions of law 2025-365's implementing texts. Outside that framework, aerial spraying remains prohibited.
How much does a vigour map cost? From €75 to €250 per hectare per flight depending on area and processing level, with genuine volume discounts beyond twenty-odd hectares or in campaigns pooled between neighbouring estates.
Can flavescence dorée really be seen from a drone? Late-summer leaf symptoms are detectable on high-resolution imagery and let you prioritise ground surveying, which remains essential to confirm cases and trigger the regulatory measures.
What about satellite imagery? Satellites cover wide areas cheaply, but their resolution mixes row and inter-row: on vines they give trends, not vine-by-vine maps. The drone is the tool for within-plot decisions; the satellite, for global multi-site monitoring.