Case guide

Syngenta and Paraquat: Check the Product and Claim

Checking a paraquat claim involving Syngenta? Keep the product and care history.

See If You Qualify

Free · No obligation · About 2 minutes

Updated Oct 4, 202614 sources

This may apply to you if

  • These suggestions help you prepare for a claim check. They are not a firm's acceptance rules.
  • Describe what you know about paraquat use, work and locations.
  • Bring Parkinson diagnosis and care records if available.

What the public record says

These are cited sources. Their inclusion does not imply that they endorse People’s Justice or reviewed this page.

Srishti Shrestha · Epidemiology Branch, National Institute of Environmental Health Sciences · First author, Agricultural Health Study Parkinson cohort

Finding: The prospective cohort did not find a statistically significant overall association for reported paraquat use. Exposure and disease measurement limits prevent treating that as proof of no possible effect.

Shrestha: pesticides and incident Parkinson disease, original cohort (opens in a new tab) · Sep 10, 2020 · Checked Oct 3, 2026

Nancy J. Rosenstengel · United States District Court for the Southern District of Illinois · United States district judge signing the cited order

Finding: The June 3, 2026 order selected nineteen optout cases for limited discovery and acknowledged declined offers. It did not announce a universal individual payment.

Rosenstengel: Paraquat Doc5834 limited discovery (opens in a new tab) · Jun 3, 2026 · Checked Oct 3, 2026

The evidence and its limits

National Institute of Environmental Health Sciences, first-author affiliation · Environmental Research · 2020

Pesticide use and incident Parkinson disease in the Agricultural Health Study

Design:
Cohort
Participants:
66,110 people:38,274 applicators and27,836 spouses;491 reported incident doctor-diagnosed Parkinson cases.
Finding:
The overall paraquat-ever-use estimate was HR 1.09, 95% CI 0.84–1.41, not statistically significant.
Main limitation
Prospective observational cohort; exposure and disease largely reported through questionnaires with partial validation. Measurement error and subgroup uncertainty mean the result is not proof of no effect or an individual cause finding.

Read the source: Pesticide use and incident Parkinson disease in the Agricultural Health Study (opens in a new tab) · Checked Oct 3, 2026

University of California, Los Angeles, first-author affiliation · International Journal of Epidemiology · 2024

Agricultural paraquat dichloride applications and Parkinson disease

Design:
Case-control
Participants:
829 Parkinson patients and824 community controls in three California counties.
Finding:
Several modeled historical agricultural exposure measures and time windows were associated with Parkinson disease; co-exposure adjustments affected estimates.
Main limitation
Address/application models are not measured personal doses; observational case-control design cannot establish individual causation. The 500-meter exposure window is not an eligibility radius. Coauthors Myles Cockburn and Beate Ritz disclose plaintiff-expert consulting against Syngenta.

Read the source: Agricultural paraquat dichloride applications and Parkinson disease (opens in a new tab) · Checked Oct 3, 2026

The short answer

Which Syngenta parties appear in the court record?
The February 2026 order names two Syngenta companies and Chevron as parties sued. Identify which party relates to your own record. Their names alone do not prove fault. [14]
How should I identify the actual paraquat product?
Keep the exact label, purchase or application record if available. A trade name is not every product. Mark details you do not know. [6]
What do the selected 2026 court orders mean?
They address offers, limited fact gathering and specific case tasks. They do not resolve every paraquat claim. Ask for the current record in your own case. [7]
Does the research decide company fault for my illness?
No. A health cause and legal fault each need proof. Some studies found links; another overall result was not clear. Keep their limits with the findings. [5]

What rules a case out

Not covered by this case

  • No internal misconduct allegation is found proved here.
  • No company-wide payment total or personal payout is supplied.
  • A company name alone does not identify your actual product or legal claim.

The process

What happens next

  1. 01

    You answer a few questions

    About two minutes. Nothing is sent until you agree on the last step and press submit.

  2. 02

    A lawyer looks at it

    A lawyer at the firm reads your answers and checks them against the current case criteria.

  3. 03

    The firm decides and gets in touch

    If the firm takes your case, you get the terms in writing to read before you sign. You can always say no.

Checking a paraquat claim involving Syngenta? Keep the product and care history. Court orders do not prove every allegation or award. Ask a lawyer to check the parties, terms and dates.

Which Syngenta parties appear in the court record?

The February 2026 order names two Syngenta companies and Chevron as parties sued. Identify which party relates to your own record. Their names alone do not prove fault.

The February 11, 2026 order names Syngenta Crop Protection LLC, Syngenta AG and Chevron USA Inc. It covers specified claims in the court group. It sets rules for seeking to end a case after a judgment motion. It does not prove that the named parties caused your disease or establish every product’s history.

How should I identify the actual paraquat product?

Keep the exact label, purchase or application record if available. A trade name is not every product. Mark details you do not know.

EPA describes paraquat as a restricted-use herbicide and identifies Gramoxone as a common end-use name. The company named in a legal headline is not a substitute for your own record. Keep the product, dates and tasks separate from later assumptions about maker responsibility.

What do the selected 2026 court orders mean?

They address offers, limited fact gathering and specific case tasks. They do not resolve every paraquat claim. Ask for the current record in your own case.

The June 3 order selected19 Nachawati opt-out cases for limited discovery after offers were declined. June10dismissed27specifiedcases for missing required questionnaire work. The September 11 order canceled a firm-specific hearing while work continued. These scopes do not certify every company claim’s current status or personal payment.

Does the research decide company fault for my illness?

No. A health cause and legal fault each need proof. Some studies found links; another overall result was not clear. Keep their limits with the findings.

The California address-model study found associations, while the prospective farm cohort’s overall paraquat result was not statistically significant. Other exposures and measurement limits matter. Plaintiff-expert consulting disclosures must be retained; neither study is a court verdict about a company or a decision on your diagnosis.

Which records and prior papers should I take to a review?

Keep product, work or address dates and medical records. Bring prior cases, dismissals and offers. Ask what each paper means for the actual claim.

CMO23’s voluntary-dismissal rule differs from the June questionnaire-dismissal order. A case number or letter should be checked in its proper context. The health-access rule has exceptions; do not assume a helper can obtain every file or that a missing paper should be recreated from memory.

Scientific evidence for this case

Paraquat claim: what to ask and what to do · Movement Disorders · 2023Cross-sectional

Paraquat and Parkinson’s Disease: The Role of Corporate Agnotology

Syngenta’s corporate predecessor ICI identified paraquat neurotoxicity in 1958 and confirmed brain penetration in 1966

Paraquat claim: what to ask and what to do · Neurology · 2013Meta-analysis

Exposure to Pesticides or Solvents and Risk of Parkinson Disease (Meta-Analysis)

Paraquat exposure was associated with an overall odds ratio of 1.64 for Parkinson’s disease, confirming a statistically significant increased risk

Paraquat claim: what to ask and what to do · Environmental Health Perspectives · 2011Cohort

Rotenone, Paraquat, and Parkinson’s Disease (FAME Study)

People who reported using paraquat had about 2.5 times the odds of Parkinson’s disease (odds ratio 2.5; 95% CI 1.4–4.7)

Find out where you stand.

The review is free and private. Asking for it doesn’t commit you to anything.

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Questions about this guide

Who owns Syngenta now?

Syngenta is owned by Syngenta Group, which is a subsidiary of China National Chemical Corporation (ChemChina), a Chinese state-owned enterprise. In 2021, ChemChina merged with Sinochem Group to form Sinochem Holdings, which now ultimately controls Syngenta Group. The Chinese state ownership is significant because it means a sovereign government entity bears the financial responsibility for Syngenta’s paraquat liabilities. China itself banned paraquat in 2017, the same year it acquired the world’s largest paraquat manufacturer.

What did Syngenta know about paraquat’s link to Parkinson’s disease?

Internal documents obtained through litigation discovery reveal that Syngenta and its corporate predecessors (ICI, Zeneca) knew about paraquat’s neurotoxicity for decades. ICI identified neurotoxic properties in 1958, confirmed brain penetration in mice in 1966, and suppressed the Louise Marks studies in the 1990s showing substantia nigra cell loss. In 2003, Syngenta developed a "Scientific Influencing Strategy" to suppress and discredit independent research. The company targeted Dr. Deborah Cory-Slechta to keep her off EPA panels and hired v-Fluence for reputation management. Dr. Ray Dorsey’s 2023 paper documented this as "agnotology" — the deliberate production of ignorance — drawing direct parallels to the tobacco industry’s denial of the smoking-cancer link.

Are Chevron and Growmark also defendants in the paraquat lawsuits?

Yes. While Syngenta is the primary defendant as the manufacturer, Chevron Phillips Chemical Company and Growmark Inc. face significant liability as major distributors and marketers of paraquat in the United States. Chevron Phillips distributed paraquat under various brand names, and Growmark — a large agricultural cooperative — sold paraquat products directly to farmers and applicators across the Midwest. Distributors share liability under product liability law when they market dangerous products without adequate warnings. The failure of all defendants to warn users about paraquat’s link to Parkinson’s disease is a central claim in the litigation, regardless of whether the specific defendant manufactured or distributed the paraquat to which you were exposed.

Sources

  1. ABA Model Rule 1.5: feesABA Model Rule 1.5: fees
  2. Southern District of New York: time limitsSouthern District of New York: time limits · court
  3. 45 CFR 164.524: access to health records45 CFR 164.524: access to health records · regulator
  4. Shrestha: pesticides and incident Parkinson disease, original cohortShrestha: pesticides and incident Parkinson disease, original cohort · study
  5. Paul: agricultural paraquat applications and Parkinson disease, original case-control studyPaul: agricultural paraquat applications and Parkinson disease, original case-control study · study
  6. EPA: Paraquat Dichloride review and acute safetyEPA: Paraquat Dichloride review and acute safety · regulator
  7. Rosenstengel: Paraquat Doc5834 limited discoveryRosenstengel: Paraquat Doc5834 limited discovery · court
  8. Rosenstengel: Paraquat Doc5839 specified dismissalsRosenstengel: Paraquat Doc5839 specified dismissals · court
  9. Southern District of Illinois: September11,2026 Paraquat textorderSouthern District of Illinois: September11,2026 Paraquat textorder · court
  10. EPA Enforcement Action Against AMVAC Includes $541,110 Penaltyecho.epa.gov · Jul 31, 2026 · regulator
  11. Syngenta settled the Bill Mertens Philadelphia bellwether on the eve of what would have been the first public paraquat/Parkinson's trial; amount undisclosed. Per the report, Syngenta has settled every trial-ready case before opening statements; a prior multi-plaintiff settlement exceeded $187M; next trial was set for April 2026. Verified via The New Lede.thenewlede.org · Jan 27, 2026
  12. An April 8, 2026 court order says co-lead plaintiffs’ counsel and defendants signed a master settlement agreement for certain paraquat claims on September 3, 2025. The order calls for information about people who declined offers or had not chosen whether to participate. It states no payment amount for any person.thenewlede.org · Apr 14, 2025
  13. Judge Rosenstengel issued the MDL-3004 Daubert orders 'Order Relating to Dr. Wells' and 'Order Relating to Dismissal of Cases' (both dated 2024-04-17 on the S.D. Ill. court's MDL page), excluding plaintiffs' sole causation expert Dr. Martin Wells as unreliable and granting judgment against the first four bellwether cases; the court then ordered selection of a new bellwether pool. Order dates verified on the court's own site; details corroborated by AboutLawsuits (secondary tracker, flagged).ilsd.uscourts.gov · Apr 17, 2024 · court
  14. Southern Illinois: Paraquat CMO23, February11,2026

Checked against 12 primary sources by People's Justice editors · Updated

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