Quercus lands $5M seed to fight resistant weeds with AI-designed proteins
What's the deal? Quercus BiosolutionsDealroom has a profile for this one. Try Dealroom →, an ag biotech startup using AI to design mini proteins for crop protection, has raised an oversubscribed $5 million seed round led by Serra VenturesDealroom has a profile for this one. Try Dealroom →. Backers include Starshot CapitalDealroom has a profile for this one. Try Dealroom →, Grantham Foundation, Flyover CapitalDealroom has a profile for this one. Try Dealroom →, Rootstock Capital, Iowa Corn Opportunities Fund, South Dakota Corn's AgriCap Fund, Kentucky Corn, AgVentures Alliance, and Ag Startup Engine.
Why now? Resistance to legacy chemical herbicides is spreading, while biological alternatives have struggled to match the efficacy of older tools. Founded in 2024 by ag veterans Jon LightnerDealroom has a profile for this one. Try Dealroom → and Matt CrispDealroom has a profile for this one. Try Dealroom →, Quercus is targeting that gap.
What's the endgame? Quercus uses AI tools first developed in drug discovery by partner Ordaos Bio to design proteins that bind to validated biological targets in weeds. Because proteins bind differently than traditional small-molecule herbicides, evolved chemical resistance won't carry over — giving farmers a genuinely new tool, according to Lightner.
The company factors manufacturability into its protein design from the start, working with precision fermentation experts on microbes that excrete the proteins into the broth. That, it says, keeps the process simple and low-cost.
By the numbers: The round sits in the 94th percentile of all-time US seed rounds in food across a sample of 4,285 deals — a sizable seed for the sector. Quercus has five active programs and multiple field trials underway.
What's next? The capital will expand targets in the herbicide program, build out the IP portfolio, and explore uses beyond weeds into fungi and insects. "We're now in what I would call a translational stage," said Crisp, adding that the funds will begin regulatory work and advance at least one product into late development.
On go-to-market, Lightner said Quercus expects "to partner at multiple layers in the system," including big seed chemistry companies and regional players closer to farmers.
The signal: Investor appetite for AI-driven crop protection is rising as growers run short of effective herbicides and regulators tighten scrutiny. Quercus is betting that tools borrowed from drug discovery can open a new category of pest control — and its cap table suggests the corn belt is willing to fund the experiment.
Read more: AgFunderNews
