The library · Herbicide
Clopyralid
A pyridine Group 4 known for Canada thistle, perennial sow thistle and volunteer alfalfa.
- Group
- Herbicide Group 4
- Family
- Phenoxys, benzoics, pyridines and quinolines
- Formula
- C6H3Cl2NO2
- Molar mass
- 192.00 g/mol
Structure: PubChem CID 15553
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
- Thistles
- Broadleaf weeds
- Canola
Good to know
- It stays in the soil and straw longer than most, so check re-cropping restrictions.
- Registered in canola, cereals and other crops, depending on the product.
- 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 Clopyralid.
| Product | Similar to | Strength |
|---|---|---|
| Clopyralid | Lontrel ® | Clopyralid 30% SL |
| Clopyralid / Fluroxypyr | Momentum | Fluroxypyr 90 g/L + Clopyralid 90 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 | — | Fluroxypyr 180 g/L emulsifiable concentrate (EC) • Thifensulfuron methyl 50% + Tribenuron methyl 25% wettable granules (WG) • Clopyralid 360 g/L liquid ( |
Sold alongside: Fluroxypyr, MCPA, Tribenuron, Thifensulfuron
Same group, same mode of action
