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Weed Control Challenge

Remember when glyphosate or other non-residual herbicides were all it took to control your wild oats and most broadleaf weeds? Unfortunately, herbicide-resistant weeds mean that Groups 1, 2, 4 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 & 2 resistant wild oats and grasses, and other annual weeds that impact yield and harvest management. Fierce controls resistant weeds before they become a problem.


  • 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 residual activity that lasts up to eight weeks
  • Two active ingredients (proven Group 14 and a new Group 15) for stronger resistance management for 2, 4, 5 and glyphosate resistant weed management and glyphosate resistant biotypes


  • Two modes of action work on the toughest weeds including dandelion, kochia, volunteer canola and pigweed species
  • Control of many weeds showing resistance to common herbicides
  • Tank mixable with most burndown and pre-emergent herbicides (i.e. glyphosate and GoldWing, BlackHawk)
  • No surfactant required
  • 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
    • 7 days prior to seeding for field corn and spring wheat
  • Treatment Area: 
    • One case treats 128 acres
  • Product Rate:
    • 85 g/ac.
  • Crop staging:
    • Fierce
    • glyphosate
    • BlackHawk or GoldWing (if used)
  • Notes: 
    • Apply Fierce up to 3 days after seeding soybeans
    • Seeding after application requires the use of minimum to zero till drills
    • Fierce should be applied a minimum of 7 days before before seeding spring wheat or corn
    • Fierce requires moisture to activate in the soil and provide up to 8 weeks residual control

Registered crops

  • Soybeans
  • Spring wheat
  • Field corn

Weeds controlled

  • Chickweed
  • Common ragweed (including glyphosate resistant)
  • Common waterhemp
  • Dandelion
  • Green foxtail
  • Green and redroot pigweed (including Group 2 and 5 resistant)
  • Kochia (Group 2, 4 and 9 resistant)
  • Lamb’s-quarters (including Group 2 and triazine resistant)
  • Wild buckwheat
  • Wild mustard
  • Volunteer canola (suppression)

Performance Tips

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