Chemical Identification
Common Name
4-amino-3,6-dichloropyridine-2-carboxylic acid
4-amino-3,6-dichloropicolinic acid
4-amino-3,6-dichloro-2-pyridinecarboxylic acid
Molecular Formula
Molecular Structure
Aminopyralid is a systemic (phloem and xylem mobile) auxin mimic with foliar and soil residual activity. It is selective to a range of arable crop, grass and perennial species. In cereals it may be applied between the 3-leaf stage and the start of stem extension (jointing).
In temperate climates, the persistence of aminopyralid in soil may mean damage to several broadleaved crops if treated fields are rotated to these crops in the same year of application. These crops include cotton, soybeans, alfalfa, peas, lentils and other legumes.
Field trials on several rangeland and pasture sites in the USA showed that aminopyralid at 53 g/ha gave excellent control of species of biennial thistle, with good selectivity to grasses. Control was achieved whether aminopyralid as applied to thistles at the rosette stage or after bolting (reported at NCWS conference, 2005).

Crop uses:
wheat, oilseed rape, pasture, palms, plantation crops, rangeland, rice, maize, sorghum, non crop areas.
Rangeland: 140-480 g/ha
Wheat: 4-10 gae/ha

Premix Parters: folpet; mancozeb.
Physical Properties
Off-white powder. Molecular weight: 207.0 g/mol;Density 1.72 (20℃, relative to water at 4℃);Melting point:161.75-165.23℃.
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Environmental Profile
WATER SOLUBILITY: 205 g/l (pH 7)


Species Value

Avian Oral

Bobwhite quail LD50 >2250 mg ae/kg bw

Avian dietary

Bobwhite quail LD50 >5620 mg ae/kg diet

Avian dietary

Mallard duck LD50 >5620 mg ae/kg diet

Acute toxicity

Rainbow trout [96 h] LC50 >100 mg ae/L

Acute toxicity

Bluegill sunfish [96 h] LC50 >100 mg ae/L

Acute toxicity

Sheepshead minnow [96 h] LC50 >120 mg ae/L

Acute toxicity

Daphnia [48 h] EC50 >100 mg ae/L

Acute toxicity

Mysid shrimp[96 h] LC50 >100 mg ae/L

Acute toxicity

Eastern oyster[48 h] Slightly toxic

Acute toxicity

EC50 >89 mg ae/L

Growth and reproduction

Daphnia [48 h] NOEC = 100 mg ae/L

Chronic toxicity

Midge NOEC = 130 mg ae/L

Acute contact

Honeybee [48 h] LD50 >100 mg ae/bee

Acute oral

Honeybee [48 h] LD50 >120 mg ae/bee

Acute toxicity

Earthworm [14 d] LC50 >100 mg ae/kg soil

Acute toxicity

Freshwater green algae[72 h] Slightly toxic ErC50 >30 mg ae/L

Acute toxicity

Freshwater blue-green algae[120 h] EC50 >27 mg ae/L

Acute toxicity

Saltwater diatom[72 h] EbC50 >77 mg ae/L

Acute toxicity

Freshwater diatom [96 h] EC50 >14 mg ae/L

Acute toxicity

Lemna[14 d] EC50 >88 mg ae/L

Fate in soil:
Aminopyralid had a mean half-life of 34.5 days over eight sites in N. America and 25 days for four sites in Europe. Laboratory studies indicated some soil mobility with a Koc of 10.8 L/kg, but movement was limited in field studies. No significant metabolites have been noted.

Fate in water:
The main route of degradation in water is by photolysis. This happens rapidly in surface water (half life 0.6 days). Rapid photolysis and limited soil movement mean that the potential for groundwater contamination is low.

Fate in air:
Potential for volatisation is extremely low.

Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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