Herbicide label
Authority Assist
Authority Assist (EPA 279-3330) is a Group 2 and 14 imazethapyr and sulfentrazone herbicide labeled for 2 crops. The label lists 69 controlled weeds, plus partial-control, suppression, and partner-control categories.
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Authority Assist label facts
- Product Authority Assist
- EPA Reg. No. 279-3330
- Registrant FMC Corporation
- Active ingredient imazethapyr and sulfentrazone
- MOA group 2 and 14
Crops on the Authority Assist label
Authority Assist is labeled for these 2 crops and uses, per the EPA label.
Need the rate or timing for one of these? Filter every label by your crop, free.
Weeds on the Authority Assist label
The Authority Assist label names 75 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 control69- amaranth, palmer
- amaranth, spiny
- amaranth, spleen
- anoda, spurred
- barnyardgrass, common
- bedstraw, catchweed
- beggarweed, florida
- buckwheat, wild
- carpetweed
- cocklebur, common
- copperleaf, hophornbeam
- copperleaf, virginia
- crabgrass, large
- crabgrass, small
- crabgrass, southern
- crownbeard, golden
- daisy, american
- eclipta
- filaree, redstem
- galinsoga, hairy
- goosegrass
- groundcherry, clammy
- groundcherry, cutleaf
- jimsonweed
- kochia
- ladysthumb
- lambsquarters, common
- mallow, venice
- marshelder
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, palmleaf
- morningglory, pitted
- morningglory, purple
- morningglory, red
- morningglory, scarlet
- morningglory, smallflower
- morningglory, tall
- mustard, black
- mustard, tumble
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- nutsedge, purple
- nutsedge, yellow
- panicum, fall
- panicum, texas
- pigweed, redroot
- pigweed, smooth
- poinsettia, wild
- poorjoe
- purslane, common
- pusley, florida
- redmaids
- redweed
- sedge, annual
- senna, coffee
- shepherd's-purse
- sida, prickly
- sida, southern
- signalgrass, broadleaf
- smartweed, pennsylvania
- spurge, prostrate
- spurge, spotted
- starbur, bristly
- thistle, russian
- velvetleaf
- waterhemp, common
Suppression
suppression6- foxtail, bristly
- foxtail, giant
- foxtail, green
- foxtail, yellow
- johnsongrass, seedling
- shattercane
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
Authority Assist 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 and your soil texture.
Get the rate for your field: build a program and FieldMarshal gives you the exact per-acre rate for your crop from the label line.
Plant-back and rotation
Your interval depends on your application rate and the rotational crop.
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.
Authority Assist FAQ
What weeds does Authority Assist control?
The Authority Assist label names 75 weeds, including palmer amaranth, spiny amaranth, spleen amaranth, spurred anoda, common barnyardgrass, and catchweed bedstraw. Control varies by crop, rate, and timing.
What crops is Authority Assist labeled for?
Authority Assist is labeled for 2 crops and uses, including soybeans and peanut.
What is the active ingredient in Authority Assist? Is it a generic?
Authority Assist's active ingredient is imazethapyr and sulfentrazone (MOA Group 2 and 14). 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 Authority Assist?
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.
Build a program →Can I tank-mix Authority Assist?
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.
Build a program →Plan in minutes, not hours.
Start with Authority Assist and let FieldMarshal build a defensible herbicide program for your field, every product, rate, and plant-back cross-referenced and checked against the label.
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Sources
Last updated 2026-07-14.