Outdoor & Yard / Compounds / Thiram

Thiram in the yard and garden

Moderate risk for your yard

Thiram — fungicide. See EDC classification.

What is thiram?

Also known as: Tetramethylthiuram disulfide, Thiuram, TMTD, Rezifilm.

CAS number
137-26-8
Molecular formula
C6H12N2S4
Molecular weight
240.4 g/mol
SMILES
CN(C)C(=S)SSC(=S)N(C)C
PubChem CID
5455

Risk for people, pets,

Moderate risk

Thiram — fungicide. See EDC classification.

Regulatory consensus

1 regulatory bodyhas classified Thiram.

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 thiram

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

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Thiram:

  • 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 thiram safe for your yard?

Thiram — fungicide. See EDC classification.

What products contain thiram?

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

See Thiram in the outdoor app

Look up products containing thiram, compare to alternatives, and explore the full data record.

Open in outdoor View raw API data

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 →