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Group 14


Spring weather couldn't care less about your weed control program, so choose the herbicide that strikes twice. With a single pass of new Authority Strike™ herbicide, you get two powerful Group 14 actions -- quick early burnoff and long-lasting extended control. Control kochia and other key broadleaf weeds like lamb’s-quarters, pigweed, Russian thistle*, wild buckwheat and waterhemp in wheat, field pea, flax and soybean.  

Quick Facts

  • A complete solution (burnoff and extended weed control) for one-pass, pre-seed weed control.  

  • Fast burnoff AND extended control of kochia and other key broadleaf weeds. 

  • Ideal when spring conditions squeeze application window. 

  • Two Group 14 modes of action.

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Product Overview

New Authority Strike™ herbicide delivers two powerful actions in one pass: a fast, effective burnoff to start – followed by long-lasting extended control to stop weed escapes. Authority Strike™ herbicide can be tank-mixed with glyphosate.  

With two Group 14 modes of action, Authority Strike™ herbicide is active on these resistant weeds: redroot pigweed (Groups 2 and 5), lamb’s-quarters (Group 2), cleavers (Groups 2 and 4), kochia (Groups 2, 4, 5 and 9) and wild buckwheat (Group 2). 

Apply to the soil surface before, or up to 3 days after, seeding.  Each 3.79 L jug treats 32 or 43 acres. Authority Strike™ herbicide requires 1/2” of moisture, all at once, for activation.  


EC = Extended Control

  • Alberta
  • Saskatchewan
  • Manitoba
  • British Columbia

Product Specifications

Tech Specs

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Chemical Group:  Group 14, Group 14 

Registered and Supported Tank Mixes: 

  • 2,4-D LV700,  

  • Aim® EC herbicide + glyphosate 

  • Aim® EC herbicide + MCPA amine + glyphosate (flax only) 

  • CF herbicide (on registered crops) 

  • Express® SG herbicide / PrecisionPac® NC-0050 herbicide 

  • Glyphosate 

  • Intruvix™ herbicide 

  • Intruvix™ II herbicide + glyphosate 

  • IPCO Convex 

  • Nu-Image® herbicide, 

  • Authority Strike™ herbicide will provide burnoff control of certain weeds that are emerged at the time of treatment and will provide extended control of certain weeds that have not yet emerged. (field peas only) 

  • (Consult the tank-mix partner label for specific application use directions and restrictions. Always follow the most restrictive label. Please refer to FMC Tank-Mix Policy.) 

Timing: Authority Strike™ herbicide alone, or in recommended tank-mixes, may be applied as a broadcast spray prior to or after planting of the crop (no later than 3 days after seeding), but prior to crop emergence. Authority Strike™ herbicide requires 1/2” of moisture, at once, for activation of the extended control component, whether the total amount of moisture is supplied by rainfall or irrigation. 

Application Information:  

  • Apply pre-plant or post-seed (up to 3 days after seeding). 

  • Early application (pre-plant) increases activation potential of the extended control component via spring showers. Post-seed application should be considered in higher disturbance situations. 

  • Clean out tank after using Authority Strike™ herbicide. When spraying Authority Strike™ herbicide for multiple days, at the end of each day, rinse tank with water and leave 1/3 full of water overnight. 

  • Do not apply Authority Strike™ herbicide to fields treated with products containing sulfentrazone in the previous year. 

  • Do not apply Authority Strike™ herbicide (or any other product containing sulfentrazone) to spring wheat if an application of Focus® herbicide (or any other product containing pyroxasulfone) was applied in the previous fall. 

  • Do not apply to soils classified as coarse-textured soils. 

  • Do not apply in any type of soil with organic matter lower than 1.5% or greater than 6%. 

  • Do not use on soils with a pH of 7.8 or greater. 

  • Surfactant: When using Authority Strike™ herbicide alone, an adjuvant is required. Use a 

  • non-ionic surfactant at 0.25% v/v (0.25 L per 100 L of spray solution) or Merge at 1% v/v 

  • (1 L per 100 L of spray solution). An adjuvant is not required when Authority Strike™ herbicide is applied with glyphosate. 

Rates & Packaging: 4 x 4.52 L jugs per case. Each 4.52 L jug treats 28-40 acres. Field peas, chickpeas, faba beans, sunflowers, flax and soybean rates are 28 – 40 ac/jug.  The spring wheat, durum wheat and flax rate is 40 ac/jug only. 

Restrictions: If there is a lack of adequate or normal soil moisture due to drought conditions following an application of Authority Strike™ herbicide, the minimum rotational crop interval listed in the table must be extended for one additional year and a representative bioassay of the field must be conducted with the potential rotational crop and adequate soil moisture to determine the crop sensitivity to Authority Strike™ herbicide. 

Water Volume: 10 US gal/ac (100 L/ha) provides best uniform soil coverage with medium to coarse droplet sizes. 

Mixing Instructions: Fill spray tank one-half to two-thirds full of water. With agitator operating, add the recommended amount of ingredients using the WAMLEGS order. 

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