Active ingredient

MCPA

Chemical name

(4-chloro-2-methylphenoxy)acetic acid

Classification

Herbicide / Agrochemical

Biochemistry

Synthetic auxin (acting like indolylacetic acid).

Mode of action

Selective, systemic, hormone-type herbicide, absorbed by the leaves and roots, with translocation. Concentrates in the meristematic regions, where it inhibits growth.

Usage

Post-emergence control of annual and perennial broad-leaved weeds (including thistles and docks) in cereals (alone or undersown), herbage seed crops, flax, rice, vines, peas, potatoes, asparagus, grassland, turf, under fruit trees, and on roadside verges and embankments, etc., at 0.28-2.25 kg/ha. Control of broad-leaved and woody weeds in forestry. Control of aquatic broad-leaved weeds. Often used in combination with other herbicides

Mammalian Toxicology

Oral: Acute oral LD50 for rats 700-1160 mg/kg. 

Skin and eye: Acute percutaneous LD50 for rats >4000 mg/kg. Not irritating to skin; irritating to eyes. Not a skin sensitiser. 

Inhalation: LC50 (4 h) for rats >6.36 mg/l.  NOEL (24 mo) for rats 20 ppm (c. 1.33 mg/kg daily), for mice 100 ppm (c. 18 mg/kg daily)

Certificate of quality

MCPA 13%SL

Item

Appearance

Content of A.I.

pH value

Specification

Light brown to brown liquid

≥13%

4.0-8.5

FAO Standard