Fierce Herbicide

Fierce Herbicide

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Product Overview

Fierce Herbicide is a highly effective herbicide that targets and controls weeds. Contains two active ingredients that are ideal in controlling unwanted weeds while protecting the crop. It offers residual control of susceptible weeds but can also be used as part of a burndown program. Fierce Herbicide requires moisture to activate so dry weather after the application may affentct its effectiveness. It is perfect to apply in fallow land, soybean, field corn, cotton, and non-crop areas. May also be used on farms in maintaining bare ground non-crop areas. Proven to powerfully control and eliminate susceptible germinating weeds when adequate moisture is provided. Rainfast for an after the application so it is considered long-lasting. Best applied uniformly through a ground application equipment with 100 to 300 liters of spray solution per hectare. Available in a 6-lb. jar.

Features and Specs

Active Ingredient Flumioxazin - 33.5% Pyroxasulfone - 42.5%
Target pests Annual Bluegrass (Poa annua) and Roughstalk Bluegrass (Poa trivialis); Rattail Fescue and Annual Fescue (Vulpia myuros); Brome spp.; Italian Ryegrass and Annual Ryegrass (Lolium perenne L. subsp. multiflorum).
For use in Grass-grown for seed (fine fescue, perennial ryegrass, tall fescue, and orchardgrass).
Application Fierce Herbicide is applied by ground or by air. Application equipment should be clean and in good repair. Nozzles should be uniformly spaced on boom and frequently checked for accuracy.
Pet safe Yes, if used as directed on the label.
Formulation Water-soluble formula.
Special Features May be applied as part of a fall burndown program for control of susceptible winter annuals.
Shipping Weight 6.00 lbs
Manufacturer Valent Usa Corp
EPA Registration 59639-193



  • Do not exceed the maximum seasonal rates as listed on this label.
  • Do not apply to frozen or snow-covered soil.
  • Do not apply this product when weather conditions favor spray drift from treated areas.
  • Do not apply during low-level inversion conditions, including fog.
  • When applying by air, observe drift management restrictions and precautions listed under “Application Information” section.
  • Any tillage operation after the application or mechanical incorporation into the soil will reduce residual weed control.

Weeds Controlled or Suppressed by Residual Activity of Fierce Herbicide

  • Bristly Starbury
  • Carpetweed
  • Chickweeds
  • Mouseear
  • Coffee Senna
  • Copperleaf, Hophornbeam
  • Dandelion
  • Eclipta
  • Evening primrose, Cutleaf
  • Florida Beggarweed
  • Florida Pusley
  • Golden Crownbeard
  • Hairy Indigo
  • Hemp Sesbania
  • Henbit
  • Jimsonweed
  • Kochia
  • Lambsquarters, Common
  • Little Mallow
  • Marestail/Horseweed

*See label for the complete list of weeds and the application rates


Before applying Fierce Herbicide, start with clean, well-maintained application equipment. The spray tank, as well as all hoses and booms, must be cleaned to ensure no residue from the previous spraying operation remains in the sprayer. Some pesticides, including but not limited to, the sulfonylurea and phenoxy herbicides, (i.e., Classic® and 2,4-D respectively) are active at very small amounts and can cause crop injury when applied to susceptible crops. The spray equipment must be cleaned according to the manufacturer’s directions for the last product used before the equipment is used to apply Fierce Herbicide. If two or more products were tank mixed prior to Fierce Herbicide application, follow the most restrictive cleanup procedure.


  1. Fill clean spray tank 1/2 to 2/3 of the desired level with clean water
  2. If a drift retardant is to be used, add 10 lbs of spray grade ammonium sulfate per 100 gallons of spray solution.
  3. To ensure a uniform spray mixture, pre-slurry the required amount of Fierce Herbicide with water prior to addition to the spray tank. Use a minimum of 1 gallon of water per 10 oz of Fierce Herbicide.
  4. While agitating, slowly add the pre-slurried Fierce Herbicide to the spray tank. Agitation should create a rippling or rolling action on the water surface.
  5. If tank mixing Fierce Herbicide with other labeled herbicides, add water soluble bags first, followed by dry formulations, flowable, emulsifiable concentrates and then solutions. Prepare no more spray mixture than is required for the immediate spray operation.
  6. Add any required adjuvants.
  7. Fill spray tank to the desired level with the water. Agitation should continue until all spray solution has been applied.
  8. Mix only the amount of spray solution that can be applied the day of mixing. Fierce Herbicide should be applied within 6 hours of mixing.


Fierce Herbicide is applied by ground or by air. Application equipment should be clean and in good repair. Nozzles should be uniformly spaced on boom and frequently checked for accuracy.


Apply Fierce Herbicide and Fierce Herbicide tank mixes with ground equipment using standard commercial sprayers equipped with flat fan (pre-plant or preemergence applications only) designed to deliver the desired spray pressure and spray volume.


Spray drift away from the site of application may cause damage to non-target vegetation. To minimize drift, apply the largest droplet size consistent with uniform coverage and satisfactory weed control.


  • Do not apply during low-level inversion conditions (including fog), when winds are gusty or under other conditions that favor drift.
  • Do not spray when wind velocity is less than 2 mph or more than 10 mph.
  • Do not apply this product by air within 40 ft of non-target plants including non-target crops.
  • Do not apply this product by air within 100 ft of emerged cotton crops.
  • Do not apply this product by air within 40 ft of streams, wetlands, marshes, ponds, lakes, and reservoirs.

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