Onion - Commercial Herbicides
Herbicides registered for commercial use on onions in Utah.
Conventional Herbicides
| Brand Name (REI/PHI) | Active Ingredient | Pre-emergence | Delayed Pre-emergence | Post-emergence | Pre-emergence | Post-emergence | Annual grass | Small-seeded broadleaves | Broadleaves | Comments |
|---|---|---|---|---|---|---|---|---|---|---|
| Aim (12hr/-) | carfentrazone | X | X | X | X | X | X | X | Use with shields between rows | |
| Dacthal (12hr/-) | DCPA | X | X | X | X | X | X | |||
| Fusilade (12hr/-) | fluazifop | X | X | X | X | |||||
| GoalTender, plus others 12hr/45d) | oxyfluorfen | X | X | X | X | X | After 2-leaf stage; Do not use on stressed onions | |||
| Gramaxone Inteon 12hr/60d) | paraquat | X | X | X | X | X | X | Restricted use product | ||
| Nortron SC (12hr/30d) | ethofumesate | X | X | X | X | X | X | X | ||
| Outlook (12 hr/30d) | dimethenamid-P | X | X | X | X | X | Apply after 2-leaf stage |
REI = Re-entry Interval (the time required to wait before people can enter field after spraying)
PHI = Post-Harvest Interval (the time required between the last spray and harvest)
Note: The information provided is not an endorsement or recommendation for any particular product. Always read the label before applying and follow the directions. Some of these materials may be tank mixed with other herbicides.