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Group 14 , 15

Authority® Supreme / West / Fall

Want to give your crops extended protection when they’re young and vulnerable? Fall application of Authority® Supreme herbicide delivers a spring barrier that early-germinating grassy and broadleaf weeds can’t get past. Two modes of action = unbeatable resistance management.

Quick Facts

  • Extended control of tough-to-kill grassy and broadleaf weeds, including industry leading kochia control
  • Dual modes of action provide a sound resistance management tool and an excellent option for herbicide layering
  • No incorporation required
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

A vigorous start for your field peas, chickpeas, soybeans and sunflowers is important for maximizing yield potential.

A fall application of Authority® Supreme herbicide, applied with or without glyphosate, can help keep fields clean in the early spring to give you time to seed into a clean field for a vigorous start. It provides extended 2-in-1 protection against many tough grassy and broadleaf weeds – while spreading out your workload between fall and spring.

Authority® Supreme 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 resistant to one or more herbicide Groups. The actives in Authority® Supreme herbicide provide activity 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), wild buckwheat (Group 2) and wild oats (Group 1).


Registered Provinces

  • Alberta
  • Saskatchewan
  • Manitoba
  • British Columbia

Product Specifications

Tech Specs

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Chemical Group: Group 14 and Group 15.

Rates and packaging: 2 x 8 L jugs per case. Each 8 L jug treats 33 or 40 acres per jug when applied for extended control.

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

Application Information:

  • Apply after any heavy harrowing or tillage event.
  • If higher disturbance seeding, consider a spring post seed application.
  • Do not apply Authority® Supreme herbicide to fields treated with products containing sulfentrazone in the previous year.
  • Clean out tank after using Authority® Supreme herbicide. When spraying Authority® Supreme herbicide for multiple days, at the end of each day, rinse tank with water and leave 1/3 full of water overnight. 
  • Clean out tank after using Authority® Supreme herbicide. When spraying Authority® Supreme 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 to soils classified as coarse-textured soils.
  • Do not apply in any type of soil with organic matter lower than 1% or greater than 6%.
  • Do not use on soils with a pH of 7.8 or greater.

Surfactant: Not Required.

Water volume: 10 US gal/ac provides best uniform soil coverage with medium to coarse droplet sizes.

Rainfastness: N/A.

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: Soybean, chickpeas, field peas

4 months: Winter wheat

12 months: Barley, canola, field corn, mustard, oats, spring and durum wheat, sunflowers

24 months: Lentils

36 months: Sugar beets

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