Herbicide label

Poast

Poast (EPA 7969-58) is a Group 1 sethoxydim herbicide labeled for 26 crops. The label lists 51 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“Sethoxydim, the active ingredient in Poast® herbicide, is a graminicide which inhibits the enzyme acetyl CoA carboxylase (ACCase), resulting in cessation of fatty acid synthesis which is essential for new growth. Poast rapidly enters the targeted grass weed through the foliage and translocates throughout the plant.”

— Poast EPA label, Reg. No. 7969-58

Poast label facts

Crops on the Poast label

Poast is labeled for these 26 crops and uses, per the EPA label.

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Weeds on the Poast label

The Poast label names 51 weeds and rates each by how the product handles it: full control, partial control, suppression, or control with a tank-mix partner. A weed can fall at more than one level, because control varies by crop, rate, and timing.

Controls

full control51
  • ryegrass, italian
  • barley, interseeded cover crops
  • barley
  • barnyardgrass, common
  • bentgrass, colonial
  • bentgrass, highland
  • bermudagrass
  • brome, downy
  • corn, volunteer
  • crabgrass, large
  • crabgrass, smooth
  • cupgrass, southwestern
  • cupgrass, woolly
  • fescue, tall
  • foxtail, giant
  • foxtail, green
  • foxtail, yellow
  • goosegrass
  • guineagrass
  • johnsongrass (no-till)
  • johnsongrass (rhizome)
  • johnsongrass
  • junglerice
  • lovegrass species
  • millet, wild-proso
  • muhly, wirestem
  • oats, interseeded cover crops
  • oats, tame
  • oats
  • wild oats
  • orchardgrass
  • panicum, browntop
  • panicum, fall
  • panicum, texas
  • quackgrass
  • red rice
  • rye, interseeded cover crops
  • rye, volunteer
  • ryegrass, annual
  • ryegrass, perennial
  • sandbur, field
  • shattercane
  • signalgrass, broadleaf
  • sprangletop, red
  • stinkgrass
  • torpedograss
  • velvetgrass, German
  • wheat, interseeded cover crops
  • volunteer wheat
  • wildcane
  • witchgrass

Weed indexes featuring this label

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Poast rates and plant-back

The label answers both with a table, not a single number. Here is what drives each answer.

Application rate

Your rate depends on your crop.

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Plant-back and rotation

Your interval depends on your application rate, the rotational crop, and your state, region, and rainfall — some intervals differ in AL, AZ, CA, FL, GA, HI, ID, LA, MS, NC, NV, OR, SC, TN, TX, VA, and WA.

Get the interval for your rotation: build a program and FieldMarshal gives you the exact plant-back for your rotational crop from the label line.

Poast FAQ

What weeds does Poast control?

The Poast label names 51 weeds, including italian ryegrass, interseeded cover crops barley, barley, common barnyardgrass, colonial bentgrass, and highland bentgrass. Control varies by crop, rate, and timing.

What crops is Poast labeled for?

Poast is labeled for 26 crops and uses, including field corn, soybeans, cotton, sunflower, and potato.

What is the active ingredient in Poast? Is it a generic?

Poast's active ingredient is sethoxydim (MOA Group 1). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.

What's the plant-back interval after Poast?

It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal gives you the exact interval for your rotation from the label line, so you can verify it.

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Can I tank-mix Poast?

It depends on your target weeds, crop stage, and which partners the label approves. Build a program and FieldMarshal checks the label for approved partners and gives the condition on each, so you can verify it.

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Sources

Last updated 2026-07-14.