Syngenta Ends Production of Parkinson's-Linked Pesticide

A controversial pesticide linked to Parkinson's disease is finally coming off the production line, bringing hope to millions concerned about agricultural chemicals.

Syngenta announced Tuesday it will stop making paraquat by the end of June. The weed killer has been used on American farms since 1964 but has been banned throughout Europe and several other countries due to health concerns.

The company cited competition from generic producers and minimal sales as reasons for the decision. However, the announcement comes as Syngenta faces more than 8,000 lawsuits from people who say they developed Parkinson's disease after exposure to the chemical.

Numerous scientific studies have found that paraquat damages brain cells in ways that can lead to Parkinson's. Internal company documents revealed by the Guardian and the New Lede showed Syngenta knew about research linking paraquat to Parkinson's decades ago.

Dr. Michael Okun, chair of neurology at the University of Florida, called the news a "public health milestone." He has advocated for banning paraquat for years.

"For decades we have warned that certain pesticides increase the risk of Parkinson's and other serious diseases," Okun said. "This moment proves that advocacy, data and courage can change the trajectory of disease."

Dr. Ray Dorsey, a neurologist who directs the Center for the Brain and the Environment, echoed that optimism. "If this is true, then fewer people are going to develop Parkinson's disease in the future," he said.

The Ripple Effect

This victory extends beyond one company's decision. Lawmakers in multiple states have introduced legislation to ban paraquat entirely, and federal legislators have joined the call for nationwide restrictions.

The momentum reflects growing awareness about environmental causes of brain diseases. Advocacy groups, scientists, and affected families have worked together to bring attention to the dangers of agricultural chemicals.

Their persistence changed corporate behavior and may reshape how America approaches pesticide regulation. The Environmental Protection Agency is now evaluating new data before issuing a final decision on paraquat.

Experts caution that generic paraquat producers may try to fill the gap left by Syngenta's exit. Nathan Donley of the Center for Biological Diversity noted that smaller companies could continue supplying the chemical as long as it remains approved in the United States.

Still, Syngenta's departure removes the largest and most powerful voice defending paraquat from the conversation. That shift could accelerate regulatory action and state-level bans.

Farmers have used paraquat on soybeans, cotton, corn, grapes, pistachios, peanuts, and many other crops. Alternative weed control methods exist, though some require different farming practices.

The change shows how sustained advocacy can protect public health, even against powerful corporate interests.