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Group 14

Authority® 480 herbicide / West / Fall

Authority® 480 herbicide delivers powerful, extended control of tough broadleaf weeds. By applying it in the fall,  growers can achieve consistent, high-performing weed control while spreading out their workload between fall and spring.

Quick Facts

  • Industry-leading performance on hard-to-kill weeds like kochia
  • Concentrated formulation for ease of use and mixing with no incorporation required
  • Also registered for pre-seed application in a variety of crops
  • Group 14 product helps with resistance management
clean fields community yields


For every acre of FMC fall herbicide you spray, we will donate up to 10 cents per acre to an organization that serves your local community.

Product Overview

Authority® 480 herbicide is a powerful, flexible Group 14 herbicide that’s ideal for fall application. Applied with or without glyphosate, it provides extended activity on challenging weeds like kochia, redroot pigweed, lamb’s-quarters, wild buckwheat and cleavers.

Authority® 480 herbicide requires moisture to be activated. By applying in the fall, it will move into soil water with the snowmelt and/or an early spring rainfall, becoming available for uptake by emerging weeds. By controlling weeds before they emerge in the spring, there’s less competition for water and nutrients. That means a better start for your crop.

Many weeds are now resistant to one or more herbicide Groups. As a Group 14, Authority® 480 herbicide is active on the following resistant weeds: redroot pigweed (Groups 2 and 5), lamb’s-quarters (Group 2), cleavers (Groups 2 and 4), kochia (Groups 2 and 9) and wild buckwheat (Group 2).

One jug of Authority® 480 herbicide treats 32 acres to 43 acres, with a convenient concentrated formulation, compared to 80 acres for one large tote of competitive granular herbicide.


Full crop listing

  • Apple
  • Asparagus
  • Bushberries
  • Brassica Head and Stem
  • Brassica (cole) Leafy Vegetables
  • Cabbage
  • Caneberries
  • Durum Wheat
  • Faba Bean
  • Field Peas
  • Flax
  • Grapes
  • Horseradish
  • Mint
  • Soybeans
  • Spring Wheat
  • Strawberry
  • Sunflower
  • Tame Mustard
  • Tomatoes
  • Tomato (transplant only)
  • Tree Nuts

Registered Provinces

  • Alberta
  • Saskatchewan
  • Manitoba
  • British Columbia

Product Specifications

Tech Specs

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Chemical Group:  Group 14 for excellent resistance management

Registered Tank Mixes:

  • Nu-Image herbicide
  • Express® SG herbicide
  • Glyphosate

Timing: Authority® 480 herbicide may be applied in the fall once soil temperatures have cooled to 10 degrees Celsius and prior to snowfall.

Application Information:

  • Apply after any heavy harrowing or tillage event.
  • If higher disturbance seeding, consider a spring post-seed application.
  • Clean out tank after using Authority® 480 herbicide. When spraying Authority® 480 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® 480 herbicide to fields treated with products containing sulfentrazone in the previous year.
  • 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.

Rates & Packaging: 4 x 3.79 L jugs per case. Each 3.79 L jug treats 32 or 43 acres.

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.

Rotational intervals and crops:

Any time: Chickpea, faba bean, field pea, flax, potatoes, soybean, sunflowers, tame mustard, wheat (spring and durum; low rate)

4 months: Winter wheat

12 months: Alfalfa, barley, canola, field corn, oats, wheat (spring and durum; low rate)

24 months: Lentils, sweet and popcorn, sorghum

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