The library · Herbicide
Pyroxasulfone
A soil-applied Group 15 for grassy weeds and small-seeded broadleaf weeds. It adds a residual layer that post-emergent sprays cannot, in a different group from the Group 1s and 2s.
- Group
- Herbicide Group 15
- Family
- Thiocarbamates, chloroacetamides and isoxazolines
- Formula
- C12H14F5N3O4S
- Molar mass
- 391.32 g/mol
- You may know it as
- Zidua, Focus
- In Canada
- Mostly branded
Structure: PubChem CID 11556910
How it kills
VLCFA inhibitors
Stops the very long fatty acids a germinating shoot needs.
Weeds die in the soil as they try to emerge.
Held in the top layer of soil, where weeds pick it up as they germinate.
Where it fits
In the season.
Commonly used on
- Wild oats
- Grassy weeds
- Kochia
Good to know
- It needs moisture to move into the soil, so dry conditions can delay it.
- Organic matter and soil texture change how it performs.
- Often sold with a Group 14 partner.
- It will not control weeds that are already up. Older labels may still call the thiocarbamates Group 8.
