Outdoor & Yard / Compounds / Myclobutanil

Myclobutanil in the yard and garden

Moderate risk for your yard

Myclobutanil — fungicide. See EDC classification.

What is myclobutanil?

Also known as: Systhane, Rally, Nova, Synthane 12E.

CAS number
88671-89-0
Molecular formula
C15H17ClN4
Molecular weight
288.77 g/mol
SMILES
CCCCC(CN1C=NC=N1)(C#N)C2=CC=C(C=C2)Cl
PubChem CID
6336

Risk for people, pets,

Moderate risk

Myclobutanil — fungicide. See EDC classification.

Regulatory consensus

1 regulatory bodyhas classified Myclobutanil.

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 myclobutanil

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

Safer alternatives

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

  • 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 myclobutanil safe for your yard?

Myclobutanil — fungicide. See EDC classification.

What products contain myclobutanil?

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

See Myclobutanil in the outdoor app

Look up products containing myclobutanil, 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 →