C-DRONE GUIDE · 9 SEPTEMBER 2026
Cherry orchards and drones: targeting thinning against Drosophila suzukii, netting, price
France harvested around 33,400 tonnes of cherries in 2024 according to Agreste, more than a third of it in the PACA region and 11,110 tonnes in Vaucluse alone, the country's top-producing département. The sector has lived with Drosophila suzukii since summer 2010, an Asian fly first detected in France in Corsica and the South-East: unlike the common vinegar fly, which only attacks already-damaged fruit, its serrated ovipositor lets it lay eggs inside a healthy, intact cherry before harvest. The losses led to an exceptional €4.7 million compensation payout in 2016, and the Gard département alone estimated its 2022 losses at €3 million. Here is what entomological research says about the shade and humidity that favour this fly inside the canopy, what a drone survey can concretely draw from it to target thinning, and how to check an exclusion net for gaps.
Published on 9 September 2026, reviewed on 9 September 2026 — regulations in force as of September 2026.
A different fly, detected in France since 2010
Drosophila suzukii, the spotted wing drosophila, was officially reported in France for the first time in summer 2010, in Corsica and then across several South-Eastern regions (Languedoc-Roussillon, Midi-Pyrénées, PACA, Rhône-Alpes), according to the European plant health reporting service (EPPO). Its distinctive feature is its ovipositor: a serrated egg-laying organ roughly 60% longer and sturdier than that of the common vinegar fly (Drosophila melanogaster). Where the latter only lays eggs in fruit that is already damaged or rotting, D. suzukii pierces the skin of a healthy, perfectly ripe cherry, directly on the tree, before any harvest takes place. Once the egg is laid, the fruit keeps developing normally in appearance: the infestation only becomes visible once larvae develop inside it, often too late to act.
The economic impact showed up quickly: an exceptional €4.7 million compensation payout was released in 2016 for the worst-affected cherry growers, and the Gard prefecture alone estimated the 2022 season's losses at around €3 million. Against a national production of around 33,400 tonnes in 2024 (Agreste), concentrated 37% in the PACA region and 22% in Occitanie, with Vaucluse as the top-producing département (11,110 tonnes), every percentage point of downgraded fruit weighs directly on a farm's bottom line. The fly also attacks other thin-skinned soft fruit — raspberries, blueberries, strawberries — but cherry trees, grown tall and far harder to protect than a low bush, remain one of the most exposed French crops.
What science says about canopy shade and humidity
D. suzukii's biology offers a concrete management lead: the fly is markedly more active in cool, humid microclimates than under dry, sunny exposure. A study by Tochen, Woltz, Dalton, Lee, Wiman and Walton, published in 2016 in the Journal of Applied Entomology, showed that humidity directly affects D. suzukii populations in blueberry crops (see the study on Google Scholar). A second study, by Diepenbrock and Burrack, published in 2017 in the same journal, measured markedly higher infestation on blackberry (Rubus) in the shaded, humid interior of the canopy than on fruit exposed at the sunny periphery (see the study on Google Scholar).
No published study has so far tested drone-based mapping of D. suzukii risk in cherry orchards: this application remains a logical extrapolation, not a validated method. But the mechanism it documents is directly usable: a 3D canopy model, of the same kind used to adjust spray volumes (see our drones in orchards guide), can pinpoint the densest foliage zones — those where interior shade and humidity are, according to these two studies, statistically most favourable to the fly — to prioritise thinning or leaf removal there rather than treating the whole orchard uniformly.
Checking a fine-mesh exclusion net
The fine-mesh insect-exclusion net (Alt'droso type, mesh opening under 0.98 mm) is today one of the most effective protections against D. suzukii, provided it is installed without a single tear or gap at ground level: unlike a standard hail net, a single opening is enough to let the fly in. On a multi-hectare orchard, a low-altitude RGB flight along the edges and support structure spots tears, over-tensioned areas and failing anchor points far faster than a ground inspection, ahead of the period of maximum vulnerability — from véraison to harvest.
The same pass records ripeness by zone: a colour map helps target a staggered, earlier harvest, the simplest lever for shrinking the window during which ripe fruit is exposed on the tree. The method for counting and tracking fruit ripeness is detailed in our guide to estimating orchard yield by drone.
Prices observed in 2026
Ranges observed for a cherry orchard in France in 2026, excl. VAT:
| Service | Range (excl. VAT, 2026) |
| 3D canopy model and foliage density map (thinning targeting) | €450 to €900 |
| RGB inspection of an exclusion net (tears, anchors) before véraison | €350 to €700 |
| Pre-harvest ripeness monitoring, one or more passes | €300 to €850 |
These amounts cover the flight, image processing and delivery of the maps; they do not include installing the net or any plant-protection treatment. In practice, the canopy-density mapping flight is best scheduled before the net closes, the net inspection right after installation, and ripeness monitoring in the days before harvest. For a cherry orchard in Vaucluse, Occitanie or elsewhere in France, request a quote stating the area, the crop stage (véraison, pre-harvest) and whether an exclusion net is already in place — our page on precision agriculture by drone covers the method across all crops.