Peptide Biofungicide Advances Toward US, EU Approval
14 September 2026, Toulouse, France: French ag-biotech company Micropep Technologies has filed regulatory dossiers in the United States and European Union for Promisin, a peptide-based biofungicide the company says works through a mode of action not currently used by any product on the market. The filings, announced July 28, 2026, follow initial regulatory submissions in Brazil and Paraguay in June 2026 and mark the widest push yet to bring a peptide biocontrol product to major row-crop and specialty-crop markets.
Promisin is built around a naturally occurring type of molecule called a micropeptide, a very short chain of amino acids that can interfere with specific biological processes inside a target organism. Rather than the broad chemical toxicity used by many conventional fungicides, Micropep’s peptide is designed to disrupt fungal cell membranes directly, weakening a pathogen’s ability to establish and spread infection on the plant. Because the mode of action differs from existing chemical fungicide classes, the company positions Promisin as a tool that can be rotated into spray programs to slow the buildup of fungicide resistance, an increasingly costly problem in crops such as soybean, where resistant strains of Asian soybean rust have reduced the effectiveness of several established chemistries.
The molecule was identified using Krisalix, Micropep’s in-house discovery platform, which combines generative artificial intelligence and machine learning models trained on biological data to screen millions of candidate peptide sequences computationally before any laboratory work begins. The platform also uses protein-peptide interaction modelling to predict how a candidate peptide will bind its target, which the company says narrows an initial pool of millions of digital candidates down to a few dozen worth testing directly in plants. Micropep describes this approach as compressing a discovery process that traditionally took years into a matter of months, though as with any AI-assisted screening method, computational predictions still require the extensive field validation that followed in Promisin’s case.
That field validation has been substantial. Micropep says Promisin has been tested in more than 200 field trials across North America, Europe and South America over more than three years of development, evaluated under high disease pressure against three major soybean fungal pathogens: Asian soybean rust, target spot and Cercospora leaf blight. The company reports consistent performance both when Promisin was used on its own and when it was tank-mixed into standard crop protection spray programs alongside conventional fungicides, though it has not published specific efficacy percentages from these trials in its regulatory announcements.
From soybean to specialty crops
The July filings extend Promisin’s target crop list beyond soybean to grapevines and potatoes, both of which face significant losses from fungal disease in major growing regions. Downy and powdery mildew in grapes and late blight in potatoes are among the costliest disease pressures in those crops worldwide, and both pathogen groups have shown resistance to multiple existing fungicide chemistries in various regions. Micropep chief executive Georg Goeres said the completion of the US and EU submissions “validates years of scientific innovation and field development,” while chief regulatory officer Dr. Kevin Leiner described the milestone as evidence that “peptide-based solutions can deliver the performance, scalability and economics required for broad agricultural adoption,” a pointed reference to earlier generations of biological crop protection products that struggled commercially because they cost more than growers were willing to pay relative to conventional chemistry.
Peptide-based biocontrol is still a young category within the broader biologicals segment, which also includes microbial biopesticides and plant extracts, but it is drawing increasing investment because peptides can be manufactured through fermentation at a cost structure closer to conventional agrochemicals than to earlier biological products. For India and other major agricultural markets, a commercially viable, resistance-breaking mode of action matters directly to growers of soybean, potato and grapes, three crops where fungicide resistance has already narrowed the list of chemistries that reliably work. If Promisin secures approval in the US and EU on the current timeline, Indian regulators and distributors are likely to see it proposed for local trials within a few years, and its success or failure in these markets will be closely watched by domestic biologicals companies and multinational crop protection firms alike as a test of whether peptide chemistry can scale commercially in row crops rather than remaining a niche, high-value product category. Micropep has not disclosed an expected approval timeline for the US or EU dossiers, and both regions typically require multi-year review periods for new active ingredients before a product can reach the market.
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