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.