The consumer watchdog agency was motivated to bring the case in part because rising costs and supply chain disruptions from Russia's invasion of Ukraine have put economic pressure on farmers, an agency official told Reuters.

Swiss-owned Syngenta and U.S.-based Corteva Inc. paid distributors not to offer farmers generic pesticides, herbicides and fungicides after the companies' patents on six chemical ingredients expired, the FTC said.

As a result, farmers have paid around 20% more, amounting to hundreds of millions of dollars a year, for the companies' products, the agency said.