On January 27, 2026, Syngenta reached a settlement with a retired landscaper who alleged that exposure to the company’s paraquat-based herbicide, Gramoxone, led to his Parkinson’s disease diagnosis. The settlement occurred just one day before the trial was set to commence in Philadelphia. ([thenewlede.org](https://www.thenewlede.org/2026/01/syngenta-settles-bellwether-trial/?utm_source=openai))
The plaintiff, 77-year-old Bill Mertens, operated a landscaping business during the 1980s and 1990s, during which he mixed and sprayed paraquat as part of his work. Despite using personal protective equipment, Mertens was exposed to the chemical and was diagnosed with Parkinson’s disease in 2021. ([thenewlede.org](https://www.thenewlede.org/2026/01/syngenta-settles-bellwether-trial/?utm_source=openai))
This case was poised to be a bellwether trial, serving as a test case in the broader litigation concerning paraquat’s alleged link to Parkinson’s disease. The outcome was anticipated to influence the direction of numerous similar lawsuits pending across the United States. ([drugwatch.com](https://www.drugwatch.com/news/2026/01/28/paraquat-lawsuit-settled-a-day-before-start-of-landmark-trial/?utm_source=openai))
Paraquat has been utilized in the U.S. since 1964 as a herbicide for controlling broadleaf weeds and grasses. While it is banned in several countries due to health concerns, it remains widely used in American agriculture. The chemical is known to be extremely toxic if ingested, and there is ongoing debate about its potential link to Parkinson’s disease. ([thenewlede.org](https://www.thenewlede.org/2026/01/syngenta-settles-bellwether-trial/?utm_source=openai))
Syngenta, along with Chevron, which distributed paraquat products until 1986, faces over 8,000 lawsuits alleging that paraquat exposure caused Parkinson’s disease. Both companies deny any liability. To date, Syngenta has settled each case set for trial before proceedings began, paying more than $187 million to settle one multi-plaintiff case. ([thenewlede.org](https://www.thenewlede.org/2026/01/syngenta-settles-bellwether-trial/?utm_source=openai))
The terms of the settlement with Mertens have not been disclosed. This development underscores the ongoing legal challenges facing Syngenta and Chevron as they continue to address numerous claims related to paraquat exposure.