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Thousands of U.S. farmers have Parkinson’s. They blame a deadly pesticide.

More than 6,400 lawsuits claim paraquat exposure caused Parkinson’s disease, despite ongoing use in the U.S. and scientific debate over its risks, U.S. court data show.

  • Thousands of U.S. farmers have filed lawsuits alleging paraquat caused Parkinson's, with more than 6,400 cases against Syngenta and Chevron pending in the U.S. District Court of Southern Illinois.
  • Paraquat is used as a burn-down weed killer, with 11 million to 17 million pounds sprayed annually on U.S. farms; it has been banned in the U.K. and China, where it is manufactured.
  • Researchers found epidemiological links including a 150% risk increase, citing the 2011 farmworker study and a central California study of 829 Parkinson's patients.
  • $187.5 million was paid in past U.S. settlements, and despite this, Syngenta continued selling paraquat in the U.S. last year while disputing causation.
  • The litigation list is expanding nearly every day as USGS pesticide-use data due in 2025 highlights Parkinson's disease as the fastest-growing neurological disorder projected to double.
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Thousands of U.S. farmers have Parkinson’s. They blame a deadly pesticide.

Paraquat is banned in more than 70 countries, but still legal in the United States. Now, a growing number of U.S. farmers are blaming the toxic pesticide for their Parkinson's disease in a large lawsuit.

·Springfield, United States
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Michigan Live broke the news in Michigan, United States on Monday, December 15, 2025.
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