The library · Herbicide
MCPA
A Group 4 broadleaf herbicide, used in cereals and flax, and a common partner in premixes.
- Group
- Herbicide Group 4
- Family
- Phenoxys, benzoics, pyridines and quinolines
- Formula
- C9H9ClO3
- Molar mass
- 200.62 g/mol
Structure: PubChem CID 7204
How it kills
Synthetic auxins
Mimics a natural plant hormone, overloading the growth system.
Broadleaf weeds twist, curl and grow themselves to death.
Taken in by the leaf, then carried with sugars down to the roots and up to the growing points.
Where it fits
In the season.
Commonly used on
- Broadleaf weeds
- Cereals
Good to know
- Often easier on crops than 2,4-D, but generally has a narrower weed spectrum.
- Sold as ester and amine forms.
- Group 4 resistant kochia has been confirmed on the Prairies. Keep drift and sprayer clean-out in mind around sensitive crops.
On Dean's list
Products with MCPA.
| Product | Similar to | Strength |
|---|---|---|
| Bromoxynil / MCPA E | Buctril M® | MCPA 280 g/l + Bromoxynil 280 g/l EC |
| Clopyralid / MCPA E | Curtail M® | MCPA 280g/l + Clopyralid 50g/l EC |
| Clopyralid/Fluroxypyr/ MCPA | Prestige | Fluroxypyr 180 g/L emulsifiable concentrate (EC) • Clopyralid 50 g/L + MCPA Ester 280 g/L |
| Fluroxypyr / Thifensulfuron / Tribenuron / MCPA Ester | Retain | Fluroxypyr 180 g/L emulsifiable concentrate (EC) • Thifensulfuron methyl 50% + Tribenuron methyl 25% wettable granule (WG) • 2,4-D Ester 660 g/L emulsifiable concentrate (EC) |
| Fluroxypyr/Bromoxynil/MCPA | Enforcer M | MCPA 200 g.a.e./l + Bromoxynil 200 g/l + Fluroxypyr 80 g./l EC |
| MCPA Ester | MCPA Ester 600 | MCPA Ester |
Sold alongside: Bromoxynil, Clopyralid, Fluroxypyr, 2,4-D, Tribenuron, Thifensulfuron
Same group, same mode of action
