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C-DRONE GUIDE · 13 SEPTEMBER 2026
Protein pea and drone: vigor, lodging and aphanomyces mapping, price
In 1993, France harvested 700,000 hectares of protein peas; by 2025, just 98,000 hectares remained, a second consecutive year of decline according to Terres Univia. The main culprit carries a name many growers know all too well: aphanomyces, a soil-borne pathogen that lingers for decades and has pushed the crop to migrate from part of the Paris Basin toward land further south. Peas remain a building block of the government's Plant Protein Plan nonetheless — France covers only 56% of its needs in protein-rich feed materials. On a crop with brittle stems and unassuming foliage, a multispectral or thermal drone flight documents what the eye struggles to catch early: a localised loss of vigor, water stress building during pod fill, a lodged patch before harvest — never replacing the soil diagnosis that alone confirms or rules out aphanomyces.
Published on 13 September 2026, updated on 22 September 2026 — regulations in force as of September 2026.
Protein pea: a crop in decline for thirty years
The fall has been vertiginous. According to Agro Matin, quoting Adrien Dupuy, an administrator at the Fédération française des producteurs d'oléagineux et de protéagineux (Fop), France harvested 700,000 hectares of peas in 1993; national acreage today sits at a fraction of that historic level. Figures from Terres Univia, the oilseed and plant-protein trade body, confirm a recent and ongoing slide: 150,000 ha in 2023, 124,000 ha in 2024, then 98,000 ha in 2025 — a second consecutive year of decline. Two causes combine: the 1995 removal of subsidies to livestock-feed manufacturers that had previously favoured French protein crops, and the gradual spread of aphanomyces (Aphanomyces euteiches), a soil-borne oomycete that causes root rot and whose resting spores survive for more than a decade in a contaminated field. Once soil is infested, the only remedy recognised by Terres Inovia is to stop growing peas on that plot for many years — which has pushed the crop back out of the Paris Basin and further south, onto less affected land.
Yields, meanwhile, are recovering: the 2025 season posted a national average yield of 35.6 q/ha, up from 27.9 q/ha in 2024, with winter peas locally exceeding 65 q/ha and spring peas averaging around 40 q/ha — enough to hold total production at 349,000 tonnes, comparable to 2024 despite the smaller area. The crop remains strategic all the same: it is one of the species targeted by the government's Plant Protein Plan, launched in late 2020, which aims to reduce dependence on imported protein — France currently covers only 56% of its needs in protein-rich feed materials. Unlike soybean, whose decline owes mostly to economic competitiveness, pea faces a persistent agronomic obstacle: a soil disease that no drone can diagnose on its own.
What a drone flight brings to a pea plot: emergence, vigor, lodging
Protein pea combines several vulnerabilities that aerial mapping helps make visible. At emergence, a low-altitude RGB drone count spots gaps and areas needing re-sowing far faster than a walked survey — the same method detailed for maize and sugar beet in our guide to drone-based emergence and plant-density counting, directly transferable to pea. During the growing season, a multispectral flight (NDVI or derived indices) maps canopy vigor and flags areas falling behind before the symptom is visible from the edge of the field — a valuable signal for targeting soil or root inspection exactly where vigor drops. A thermal flight, in parallel, documents water stress during pod fill, the period when spring pea is most sensitive to a lack of water, even on rain-fed plots.
Pea also has notably thin, brittle stems: lodging, the canopy collapsing before harvest under wind, rain or simply the weight of the pods, affects nearly every field to some degree and seriously complicates the combine harvester's pass. A drone survey carried out in the days before harvest can precisely delimit the lodged areas, adapt forward speed and cutter-bar height section by section, and objectively document the extent of the phenomenon for an insurance file if the lodging follows a weather event — a logic already detailed for textile flax, another stemmed crop where lodging directly determines the harvest's value.
What research shows — and does not yet show — about drones and pea aphanomyces
Research on aphanomyces is advancing, but not yet at the scale of a drone flying over a pea field. A US team led by Milton Valencia-Ortiz, Rebecca J. McGee and Sindhuja Sankaran published a 2025 study in Physiological and Molecular Plant Pathology using hyperspectral imaging on pea plants inoculated under hydroponic conditions: the spectral response of leaves and roots shifts within days of inoculation, ahead of any visible symptom (see the study). It is a solid proof of concept, but one measured in the lab, on isolated plants — nothing yet shows that a sensor carried by a drone tens of metres up captures as clean a signal across a whole field canopy.
The closest evidence of real-world use comes from a related crop, lentil — susceptible to the same pathogen. A team led by Afef Marzougui, Yu Ma, Chongyuan Zhang, Rebecca J. McGee, Clarice J. Coyne and Dorrie Main, published in 2019 in Frontiers in Plant Science, combined greenhouse RGB and hyperspectral imaging with, notably, drone-mounted multispectral imagery in the field to evaluate aphanomyces resistance across 173 lentil lines — finding moderate to strong correlations between extracted indices and visual severity scores (see the study). On lodging, finally, a Canadian team from Agriculture and Agri-Food Canada led by Shubham Subrot Panigrahi and colleagues, published in 2025 in Sensors, combined LiDAR and drone multispectral imagery to estimate dry bean plant height, lodging and seed yield (see the study) — a different legume, but a method directly transferable to mapping pea lodging ahead of harvest.
What a drone never decides, and 2026 prices
The honesty clause. Aphanomyces is a soil disease, not a foliar one: its resting spores live in the ground, out of reach of any aerial camera. The only reliable diagnosis before sowing remains a laboratory soil test (a bioassay or PCR analysis, offered notably by Terres Inovia and specialised labs), which measures a field's infective potential before pea is sown there again. A drone can point that process in the right direction — a vigor map showing a declining patch in a field with a doubtful history is a good reason to sample it — but it never replaces the analysis itself, or the rotation decision that follows. Nor does it measure deep soil water reserve or grain protein content, two parameters that remain the agronomist's and the grain lab's job.
Orders of magnitude observed in France in 2026, excluding VAT:
| Service | Observed price (excl. VAT) |
|---|---|
| Emergence count and gap detection (up to 20 ha) | €250 to €500 |
| Multispectral vigor mapping, single pass during growth | €300 to €600 |
| Thermal water-stress flight during pod fill | €300 to €600 |
| Pre-harvest lodging mapping | €250 to €500 per outing |
| Combined package: emergence + vigor + lodging over a season | €700 to €1,300 depending on surface |
These missions build on our precision agriculture by drone offer; the regulatory information on this page reflects the rules in force in September 2026. If lodging or crop decline follows a recognised weather event, the same survey can feed a claim file built along the lines of our guide to crop insurance and the claim file after a climate-related loss. Request a quote stating the area, the pea type (winter or spring), and the priority objective — emergence, vigor, water stress or lodging.