Outdoor & Yard / Compounds / Thiophanate-methyl

Thiophanate-methyl in the yard and garden

Moderate risk for your yard

Thiophanate-methyl — fungicide. See EDC classification.

What is thiophanate-methyl?

Also known as: Methylthiofanate, THIOPHANATE METHYL, Thiophanate M, Methyl topsin.

CAS number
23564-05-8
Molecular formula
C12H14N4O4S2
Molecular weight
342.4 g/mol
SMILES
COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC
PubChem CID
3032791

Risk for people, pets,

Moderate risk

Thiophanate-methyl — fungicide. See EDC classification.

Regulatory consensus

1 regulatory bodyhas classified Thiophanate-methyl.

AgencyYearClassificationNotes
EDC Assessment—Suspected endocrine disruptor

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where your yard encounter thiophanate-methyl

  • Agricultural Products — crop treatment, soil application
  • Food Chain — residue on produce, water contamination

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Thiophanate-methyl:

  • Integrated Pest Management (IPM); Biopesticides; Biological control
    Trade-offs: Combines biological, cultural, and targeted chemical controls; reduces overall chemical use 30-70%; requires trained practitioners and monitoring infrastructure; higher management complexity; proven effective at scale in many crop systems.
    Relative cost: 1.2-2×

Frequently asked questions

Is thiophanate-methyl safe for your yard?

Thiophanate-methyl — fungicide. See EDC classification.

What products contain thiophanate-methyl?

Thiophanate-methyl appears in: crop treatment (Agricultural products); soil application (Agricultural products); residue on produce (Food chain); water contamination (Food chain).

See Thiophanate-methyl in the outdoor app

Look up products containing thiophanate-methyl, compare to alternatives, and explore the full data record.

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Sources (1)
  1. PubChem (2026) — database

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →