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Fierce® herbicide provides extended grass and broadleaf weed control for herbicide-tolerant soybeans, and wheat crops with two active ingredients (Group 14 and 15) to help manage resistance weeds.


Active ingredients:  Group 14 (flumioxazin), Group 15 (pyroxasulfone)
Application timing: Fall apply as late as possible but prior to freeze up for any registered crop, pre-plant or pre-emergent for soybeans, apply up to 3 days after seeding soybeans. should be applied a minimum of  7 days prior to seeding field corn and spring wheat
Treatment rate:  One case treats 128 acres (85 g/ac.)
Tank-mix order: Fierce, BlackHawk or GoldWing ( if used), glyphosate
Notes:  Seeding after application requires the use of minimum to zero till drills, requires moisture to activate in the soil and can provide up to 8 weeks extended control

Registered crops

  • Soybeans
  • Spring wheat (not including durum) 
  • Field corn

Weeds controlled

  • Chickweed
  • Dandelion
  • Green foxtail
  • Green and redroot pigweed (including Group 2 and Group 5 resistant biotypes)
  • Kochia (Group 2, 4 and glyphosate-resistant biotypes)
  • Lamb’s quarters (including Group 2 and triazine-resistant biotypes)
  • Volunteer canola (suppression)
  • Wild buckwheat
  • Wild mustard

Weed Control Challenge

Remember when glyphosate or other non-residual herbicides were all it took to control wild oats and most broadleaf weeds? Unfortunately, herbicide-resistant weeds mean that Groups 1, 2, 4 ,5 and 9 can’t handle the problems alone anymore. Maximizing soybean and wheat yields depend on residual control of tough grass and broadleaf weeds.

Nufarm Solution

Fierce herbicide delivers the broadest spectrum and longest residual weed control available for IP, conventional and herbicide-tolerant soybeans and wheat crops. Pyroxasulfone is registered for suppression of wild oats and control of various foxtail and brome species at a rate consistent with the upper registered range of Fierce. This provides another option to reduce the effect of Group 1 and 2 resistant wild oats and grasses, and other annual weeds that impact yield and harvest management. 


  • Better performance than other leading herbicides on tough broadleaf weeds
  • Grassy weed management for cleaner fields with a new mode of action
  • Longer control with extended residual activity that lasts up to eight weeks
  • Two active ingredients (proven Group 14 and new Group 15)  for stronger resistance management


  • Two modes of action work on the toughest weeds including dandelion, kochia, volunteer canola and pigweed species
  • Tank mixable with most burndown and pre-emergent herbicides (i.e. glyphosate, BlackHawk and GoldWing)


  1. Emerged weeds – use with glyphosate
  2. Flushing weeds – residual activity for newly emerging weeds
  3. Emerged crop – Fierce alone can be used up to 3 days post seeding but prior to emergence of soybean, wheat requires application 7 days prior to seeding
  4. Refer to label or crop guide for rates and use patterns
  5. DO NOT incorporate after application or anytime prior to seeding
  6. Pre-seeding applications require the use of minimum disturbance seeding systems
  7. Non-ionic surfactant required if glyphosate is not being tank mixed