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Poast Ultra is the benchmark when it comes to safe, reliable and effective annual grass control.

  • Provides proven performance for 50 registered crops, including flax, lentils, dry beans, field peas, canola
  • Has one of the widest windows of application
  • Proven to be the most effective across a broad range of environmental conditions

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Weed Management

Weed Class List of Weeds
Grassy weeds controlled Barnyard grass
Fall panicum
Green foxtail
Persian darnel
Proso millet
Volunteer barley
Volunteer corn
Volunteer wheat
Wild oats
Witch grass
Yellow foxtail
Grassy weeds suppressed Foxtail barley*
Quack grass**

Weeds shown are controlled at the 0.19 L/acre rate when applied at the 1- to 6-true-leaf stage, up to 3 tillers, unless otherwise indicated.

*Suppression at the 0.44 L/acre rate when applied at the 1- to 4-true-leaf stage, prior to tillering.
**Suppression at the 0.19 L/acre rate when applied at the 2- to 5-true-leaf stage and control at the 0.44 L/acre rate when applied up to the 3-true-leaf stage.

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How it Works

  • Poast Ultra herbicide is a systemic herbicide.
  • Uptake into the plant is primarily through the leaves.
  • Once treated, susceptible grasses that were actively growing prior to treatment stop growing and undergo yellowing at the new growth.

Approved Crops
Field peas
Beans (white, kidney, pinto, adzuki, faba, lima, mung)
Flax (including low linoleic acid varieties)
Creeping red fescue
Snap common beans
Sugar beets
Plus 34 other crops

Application Tips

  • Reduced rates are not recommended, since they will result in inconsistent weed control.
  • Poast Ultra is extremely rainfast. Only one hour is required following application.
  • One of the few grass products registered for aerial application. Consult label for instructions.
  • The effectiveness of Poast Ultra should not be affected if spraying is delayed, even if the herbicide remains in the tank overnight. Agitate before spraying.
  • Poast Ultra applied to quackgrass at the 4- to 5-leaf stage will provide acceptable control.
  • Can be applied following or prior to Liberty.

When to Apply

Product Application Timing
Crop Any crop that Poast Ultra is registered for
Grassy Weeds 1-to 6 true leaf stage, up to 3 tillers

How Much to Apply

  • Each case of Poast Ultra contains enough herbicide to treat 80 - 120 acres. The surfactant Merge® is required for herbicide activity and is available separately from your retailer.
  • Always ensure that the rate of Merge is 1.0 L/100 L of spray solution (1.0% spray solution) for optimal performance.

For example:

AcresWater RequiredMerge RequiredPoast Ultra Required
80 acres (regular ground rate) 5 imp. gallons/acre 0.2 L/ac 0.19 L/ac
120 acres (small grass ground rate) 10 imp. gallons/acre 0.4 L/ac 0.13 L/ac
80 acres (regular air rate) 2.5 imp. gallons/acre 0.10 L/ac 0.19 L/ac

Mixing Instructions

  1. Fill clean spray tank half full with clean water. Start agitation system.
  2. If tank-mixing with Muster herbicide add tank-mix partner now. Agitate for 2 - 3 minutes. Note: Always add Muster to clean water. When refilling the tank for repeated spray applications, add Muster to a small container of clean water, mix well to form a slurry, then add to the spray tank.
  3. Add the correct amount of Poast Ultra. Continue to agitate.
  4. If required, add recommended broadleaf herbicides such as MCPA Ester, Lontrel 360, Liberty or Buctril M.
  5. Add the correct amount of Merge along with the remaining amount of water necessary to fill the spray tank.
  6. Continue to agitate or run the by-pass system.
  7. After any break in the spraying operation, agitate thoroughly before spraying again.

Tank Mixes

Poast Ultra delivers tank-mix flexibility in flax, field peas and canola (including all herbicide-tolerant varieties).

Crop Rates (L/ac) Tank-mixes
Flax* Buctril® M
+ Poast Ultra
+ Merge*
0.405 L/acre (including Solin)
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
Logic M
+ Poast Ultra
+ Merge*
0.405 L/acre
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
Lontrel® 360
+ Poast Ultra
+ Merge
0.17 L/acre to 0.34 L/acre
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
Lontrel 360
+ MCPA Ester
+ Poast Ultra
+ Merge
0.17 L/acre
+ 0.34 L/acre to 0.45 L/acre of 500 g/L formulation
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
Conventional canola Lontrel
+ Poast Ultra
+ Merge
0.17 L/acre to 0.34 L/acre
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
+ Poast Ultra
+ Merge
8 to 12 g/acre
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
+ Muster
+ Poast Ultra
+ Merge
0.17 L/acre
+ 8 g/acre
+ 0.13 to 0.19 L/acre
+ 0.4 L/acre
Liberty Link® canola Liberty
+ Poast Ultra
+ Merge
1.08 L/acre
+ 0.09 L/acre
+ 0.4 L/acre
  • Allow 4 days between application of Poast Ultra and application of herbicides other than those registered for tank-mixing.
  • Allow 5 days between application of Sencor® and Poast Ultra.
  • Allow 14 days for re-growth when applied in sequence with a grass control herbicide.

*These tank-mixes may reduce grass control, especially under adverse weather conditions.

Follow Crops

  • Allow a minimum of 14 days between application of Poast Ultra and replanting of a cereal or grass crop. Otherwise, no restrictions apply when Poast Ultra is sprayed alone.

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Product Specifications

Size (units x size): 2 x 7.7 L
Product Article #: 59025440
PCP #: 24835
Ontario Classification #: 3
Gross Weight of Package: 17 kg
Units/Pallet: 36 Cs / 72 Jugs
PTS - T/L (48 foot): 24
Warehouse Stack Height: 3 pallets
Heated Storage: No
Flash Point: 65 °C
TDG Information: Not Regulated

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