France has reauthorised triallate, a herbicide already banned from its market, for a 120-day window on winter barley — and the move has already triggered a legal challenge.

The 120-day derogation gives winter barley growers temporary access to a product French regulators had previously withdrawn. Triallate, a thiocarbamate herbicide long used against grassweeds, lost its approval amid safety and environmental concerns, and its return — even on a strictly limited basis — marks a sharp reversal for French crop protection policy.

The exemption applies specifically to winter barley. Growers of other crops remain without access, which narrows the decision's practical effect but signals official acknowledgement that growers face a serious gap in grassweed control options.

The reauthorisation has not gone unchallenged. A legal challenge has been filed against the decision, putting the 120-day window under judicial scrutiny before the treatment season even closes. Opponents of the move argue that a banned substance cannot simply be reinstated through a temporary exemption, and the court's handling of the case will test how much flexibility French authorities have when agronomic pressure collides with pesticide restrictions.

Why the reversal matters

The core issue is blackgrass and other grassweeds. Where residual chemistry has thinned out and resistance to remaining actives is widespread, triallate has retained a role as a soil-applied residual option in other producing countries. French barley growers have been pressing for access on the argument that alternatives do not deliver comparable control in the window they need.

A 120-day authorisation is short. It covers roughly one treatment cycle, which means growers who obtain product must plan applications tightly within the permitted period. It also means supply is likely to be tight, as distributors move limited stock into the eligible crop sector.

The legal question

The challenge now before the courts turns on whether a derogation can override a standing ban. Similar disputes have played out across the EU, where member states have used emergency authorisations to keep products available after formal non-renewal. France's own record on such exemptions has drawn criticism from environmental groups before, and the triallate case gives them a fresh test.

For growers, the immediate risk is legal rather than agronomic. If the challenge succeeds mid-window, product already purchased and applied could leave growers exposed on both compliance and residue grounds. Buyers and cooperatives handling malting barley in particular will be watching the court's timetable closely.

What to watch

Three things determine how this plays out. First, the court's ruling on the challenge — and whether it arrives before the 120-day window closes. Second, whether France extends the exemption beyond the initial period, which would invite a harder legal fight. Third, whether other member states follow the French precedent and issue their own triallate derogations for winter cereals.

Winter barley growers with grassweed problems should track the court schedule and confirm with their distributor that product sourced under the exemption carries full documentation, in case the legal position shifts before applications are complete.