First Trials Scheduled in Long-Running Paraquat Litigation
The first three trials have been scheduled to begin in October 2025 in a multidistrict litigation with over 5,800 plaintiffs claiming that exposure to the pesticide paraquat dichloride caused them to develop Parkinson’s disease. A second set of trials is scheduled to begin in April 2026.
The case was filed in June 2021. A previous set of trial cases were tossed in April 2024 after the court ruled that expert testimony linking the herbicide to Parkinson’s disease relied on “methodological contortions and outright violations of…scientific standards.”
Defendants Syngenta and Chevron maintain that there is no causal link. They also argue that the litigation is “burdened by cases alleging implausible theories of paraquat exposure,” despite court efforts to clean the docket of cases that “should never have been filed.”
EPA has not found a “clear link” between paraquat exposure from labeled uses and Parkinson’s disease or cancer. However, on January 17, 2025, EPA asked the Ninth Circuit to allow the agency to withdraw a 2021 interim decision on paraquat to give the agency more time to consider its health risks.
According to EPA, paraquat is one of the most widely used pesticides in the US. It often referred to as Gramoxone, the name of a popular end-use product manufactured by Syngenta. Chevron stopped manufacturing and distributing paraquat in 1986.
The case is In Re: Paraquat Products Liability Litigation v. Syngenta Crop Protection, LLC, No. 3:21-md-03004 (S.D. Ill.).