A ladybird in the middle of an aphid colony is an easy picture of biocontrol: use a natural interaction to contain a pest. On a farm, the reality is more demanding. The right organism must be identified, released or protected at the right time, weather must be considered, and results must be monitored. Plant biostimulation answers a different question: how can a crop use available nutrients more efficiently or cope better with a non-living stress such as heat or limited water?

On 9 September 2026, France’s Ministry of Agriculture brought both approaches into focus with a call for projects titled “Accelerating the deployment of biocontrol and biostimulation”. The news matters because the programme is not limited to discovering another molecule or organism. It targets the difficult step between a solution that works in a trial and a method that farmers can use, repeat and afford under real conditions.

What does the new France 2030 call fund?

The call was launched on 16 July under the Grand Challenge for Biocontrol and Biostimulation for Agroecology, a France 2030 initiative operated by Bpifrance. It remains open until 9 September 2027, subject to available funding, with the first interim deadline on 4 November 2026 at noon Paris time. The schedule and detailed criteria appear on the Ministry’s official page.

One track supports new organisations or activities built around innovative business models. It requires a project base of at least €1.2 million, offers up to €1 million in aid and allows up to four years. The second track aims to multiply the use of existing methods with economic, environmental and social potential. It requires a project base of at least €1.5 million, offers up to €2 million in aid and allows up to five years.

This is not a consumer rebate or a scheme for buying a product. Projects must be run by a consortium with several public or private partners, including at least one company as lead and one scientific partner. That structure reveals the problem the call is trying to solve: a biological solution does not spread simply because it exists. It must also be produced, distributed, tested locally, explained and supported while users take on the risk of adoption.

What is the difference between biocontrol and biostimulation?

Biocontrol protects plants against harmful organisms. The French Ministry of Agriculture defines it through natural mechanisms that manage pest populations rather than promise eradication. It covers macro-organisms such as certain beneficial insects, mites and nematodes, as well as products based on micro-organisms, chemical mediators such as pheromones, and substances of plant, animal or mineral origin.

The methods are not interchangeable. A ladybird or its larva may eat aphids. An authorised product based on Bacillus thuringiensis may target certain caterpillars when used under its approved conditions. In an orchard, pheromone dispensers can disrupt mating in a particular moth. All are forms of biocontrol, but they have different targets, timings and precautions.

A plant biostimulant does not directly control a pest. EU Regulation 2019/1009 defines it as a product that stimulates plant nutrition processes independently of its nutrient content. Its claimed purpose must concern nutrient-use efficiency, tolerance to abiotic stress, quality traits or the availability of confined nutrients in the soil or rhizosphere.

This prevents two common shortcuts. A biostimulant is not merely a renamed fertiliser, because supplying nutrients is not its function. Nor is it a treatment for disease or insects. Helping a plant cope with stress does not mean replacing water, sound nutrition, an adapted variety or healthy soil.

Why can a promising solution disappoint in the field?

Many biological solutions rely on a living organism, a chemical signal or an interaction among species. Performance can vary with temperature, humidity, pest stage, crop condition, application and surrounding practices. A result in a greenhouse or test plot therefore does not automatically transfer everywhere.

INRAE describes this shift in “Biocontrol: from curative to preventive”. Conservation biological control, for example, makes the environment favourable to natural enemies before pest pressure becomes too high. It may involve hedges, flower strips, untreated refuges, regular monitoring and coordination across neighbouring fields. The outcome comes from a system, not an isolated bottle.

Diagnosis matters just as much. Beneficial and pest larvae can be confused. A pheromone works only on its intended species. A micro-organism must meet its target at the relevant stage. If an intervention comes too late, saying that “biocontrol does not work” may hide a timing or integration problem.

The main bottleneck is organising adoption

The cost of adoption goes beyond a purchase price. It includes observation time, training, application equipment, possible cold-chain or storage requirements for living organisms, access to advice and the risk of a less predictable first season. For a small farm, those hidden costs may delay an otherwise useful method.

The Parsada projects described by INRAE in February 2025 illustrate the collective approach. Research teams, technical institutes, companies and agricultural sectors work together on odours that attract or confuse pests, the durability of control methods, establishment of beneficial organisms and combinations of partial measures. The aim is not to proclaim a universal solution but to build usable references and transfer them to field practitioners.

Four questions help test a project’s value:

  • Does it actually reduce conventional treatment use or risk across the whole production system?
  • Does it remain effective under different soil, climate and pest-pressure conditions?
  • Is its full cost, including advice and labour, manageable for the user?
  • What happens to non-target organisms, and does effectiveness persist over time?

These questions avoid two extremes: rejecting a method because it lacks the instant effect of a conventional product, or adopting it merely because it is described as “natural”. Biocontrol plant-protection products still undergo risk assessment and require market authorisation. Gardeners should use only authorised products and follow the approved crop, target, dose and safety instructions.

What can gardeners do now?

Observe before acting. Identify the pest, check whether predators are already present and follow damage over time. An aphid colony surrounded by ladybird, hoverfly or lacewing larvae may not require the same response as a declining plant with no visible beneficial insects.

Prevention also matters: diverse crops, rotations, adapted varieties, covered soil, coherent watering, refuges for beneficial insects and targeted removal of badly affected plant parts. These measures do not make a garden invulnerable, but they improve the conditions in which natural regulation or an authorised product can work.

Finally, the label matters more than the slogan. “Biocontrol”, “micro-organism” or “natural substance” does not mean a product suits every crop, dose or growth stage. Garden-use authorisation, target, harvest interval and required protection must be checked before application.

What does this mean for local food?

Methods adapted to local conditions can make small-scale production more robust, but they cannot remove every hazard or surplus. One plot may succeed while another is hit; a crop may ripen all at once. Local resilience also depends on moving that food to people who can use it.

Seeed enables individuals and producers to give, sell or swap harvests and local products with people nearby. That direct connection does not replace research or agronomic advice. It can, however, help make use of an available harvest, reduce waste and connect different local sources of food.

From an isolated product to a reliable method

The September 2026 call sends a precise signal: innovation matters only if it can be used over time. For both biocontrol and biostimulation, field deployment requires evidence, protocols, advisers, workable business models and feedback from users. Progress should be measured not by the number of solutions announced, but by their ability to fit into farming systems that rely less on conventional treatments without shifting risks or weakening producers.

Sources

Cover image: “Lady bug eating aphids”, David S. Ferry III, 12 February 2020, via Wikimedia Commons, licensed under CC0 1.0.