Azoxystrobin in the yard and garden

What is azoxystrobin?

The IUPAC name is methyl (E)-2-(2-(6-(2-cyanophenoxy)pyrimidin-4-yl)oxyacetyl)benzoate.

Also known as: methyl (E)-2-(2-(6-(2-cyanophenoxy)pyrimidin-4-yl)oxyacetyl)benzoate, Amistar, Bankit, Heritage.

IUPAC name

methyl (E)-2-(2-(6-(2-cyanophenoxy)pyrimidin-4-yl)oxyacetyl)benzoate

CAS number

131860-33-8

Molecular formula

C22H17N3O5

Molecular weight

403.39 g/mol

SMILES

COC=C(C1=CC=CC=C1OC2=NC=NC(=C2)OC3=CC=CC=C3C#N)C(=O)OC

PubChem CID

3034285

Regulatory consensus

2 regulatory and scientific bodies have classified Azoxystrobin. The classifications differ — that's the data.

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 azoxystrobin

• agricultural fungicide (cereals, fruits, vegetables)
• turf fungicide
• crop residues

Safer alternatives

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

• Trifloxystrobin (same QoI class, lower aquatic toxicity)
  Trade-offs: Same mode of action (FRAC Group 11) — cross-resistance. Lower aquatic toxicity profile.
  Relative cost: Similar
• Copper hydroxide (inorganic fungicide)
  Trade-offs: Copper accumulation in soil. Lower efficacy for some diseases. Contact-only (no systemic activity).
  Relative cost: 0.5×

Frequently asked questions