“Quercus Biosolutions” is part of a new wave of agricultural startups trying to rethink crop protection from the ground up. Instead of relying on conventional chemistries alone, the company is developing AI-designed “mini proteins” that could unlock new modes of action and help tackle herbicide-resistant weeds.
Quercus Biosolutions is a St. Louis–based startup founded in 2024 by ag industry veterans, including CEO Dr. Jon Lightner and co‑founder Matt Crisp. The company recently came out of stealth with pre‑seed funding and a focus on crop protection rather than trait or seed sales. Their core bet: they can use generative AI tools, originally built for human drug discovery, to create a new category of protein-based herbicides and other crop inputs.
To move quickly, Quercus has partnered with Ordaos Bio, an AI protein design company, and Solis Agrosciences for greenhouse and lab testing. That gives them a “lab‑in‑the‑loop” pipeline, where computational designs are rapidly tested on real plants, and the results feed back into the models.
Quercus is building its “mini proteins” (also called peptides or micropeptides) from scratch. These are short chains of amino acids designed to hit very specific sites of action inside plants, such as key enzymes or receptors involved in weed growth. In practice, they behave a lot like a chemical active ingredient—defined, consistent, and measurable—but break down like biologicals once their job is done.
Using a Nobel Prize-winning toolkit developed for protein structure, Quercus can predict how a protein will fold, how it will interact with a known target, and how stable it will be in the field. They start from crystal structures of well-understood plant proteins, design new mini proteins that fit those active sites, and then screen them in vitro and in planta. The first applications they’ve talked about publicly are in post‑emergent weed control, positioned “beyond glyphosate” with new modes of action.
From a grower’s perspective, the promise is to pair the reliability of a good herbicide with the regulatory and environmental profile of a biological. Quercus’ leadership says they are benchmarking their proteins head‑to‑head against the best current chemistries, aiming for similar weed knockdown but with proteins that do not persist in soil or water for decades. Because these actives are proteins, they are expected to fall under EPA’s biopesticide framework, which today generally carries lower registration costs and faster timelines than many conventional actives.
The company also argues that AI-designed proteins open up brand‑new modes of action, which could help manage resistance pressure that’s undermining both herbicides and Bt traits. In theory, that could mean more tools in the toolbox for tough-to-control species, and more flexibility in rotating modes of action over time.
Quercus’s technology is still in its early days. They’ve reported proof‑of‑concept data showing that sprayed mini proteins can enter plant tissues and reach their intended cellular targets, but no commercial products are on the market yet. Lightner says their first product is likely to be a broad-acting herbicide that is effective against “lots and lots of weeds.”
A future Quercus product will also likely be familiar to farmers: a jug or tote you run through standard sprayers, with label guidance on timing, rates, and tank mixes, but with protein-based actives instead of traditional molecules. And if they work, Lightner thinks these types of molecules could account for half the crop protection market within the next 10 to 15 years. You can learn more at Quercus Biosolutions HERE. For full disclosure, I am an early investor in this company, and I am excited about the opportunities ahead! (Sources: GlobalAgInvesting, Agfunder News, Ordaos)
