Syngenta Settled Every Paraquat-Parkinson's Lawsuit Before Trial While Rejecting the Science

Syngenta settled all paraquat litigation before any case reached trial, including a January 2026 settlement. Plaintiffs alleged the herbicide causes Parkinson's disease. Melbourne neurologist Wes Thevathasan says epidemiological studies show paraquat roughly triples Parkinson's risk. Syngenta maintains no scientific evidence supports the link. Paraquat is banned in over 70 countries. Generic versions remain on sale in Australia.