Herbicide label
Authority XL Herbicide Label
Authority XL (EPA 279-3413) is a Group 2 and 14 chlorimuron and sulfentrazone herbicide labeled for 1 crops. The label lists 47 controlled weeds, plus partial-control, suppression, and partner-control categories.
Authority XL label facts
- Product Authority XL
- EPA Reg. No. 279-3413
- Registrant FMC Corporation
- Active ingredient chlorimuron and sulfentrazone
- MOA group 2 and 14
Crops on the Authority XL label
Authority XL is labeled for these 1 crops and uses, per the EPA label.
Weeds on the Authority XL label
The Authority XL label names 59 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 control47- amaranth, palmer
- amaranth, spiny
- beggarweed, florida
- carpetweed
- chickweed
- cocklebur, common
- copperleaf, hophornbeam
- copperleaf, virginia
- dandelion
- garlic, wild
- henbit
- horseweed
- jimsonweed
- kochia
- lambsquarters
- prickly lettuce
- mallow, venice
- morning glory, annual
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, pitted
- morningglory, smallflower
- morningglory, tall
- mustard, tansy
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- nutsedge, purple
- nutsedge, yellow
- pennycress, field
- pigweed, redroot
- pigweed, smooth
- poinsettia, wild
- purslane, common
- ragweed, common
- ragweed, giant
- senna, coffee
- shepherd's-purse
- sida, prickly
- smartweed
- spurge, spotted
- star of bethlehem
- sunflower, wild
- thistle, russian
- velvetleaf
- waterhemp, common
Partial control
partial12- barnyardgrass, common
- burcucumber
- crabgrass
- foxtail
- goosegrass
- johnsongrass, seedling
- mexicanweed
- panicum, fall
- panicum, texas
- sesbania, hemp
- sicklepod
- signalgrass, broadleaf
Authority XL 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.
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 XL FAQ
What weeds does Authority XL control?
The Authority XL label names 59 weeds, including palmer amaranth, spiny amaranth, florida beggarweed, carpetweed, chickweed, and common cocklebur. Control varies by crop, rate, and timing.
What crops is Authority XL labeled for?
Authority XL is labeled for 1 crops and uses, including soybeans.
What is the active ingredient in Authority XL? Is it a generic?
Authority XL's active ingredient is chlorimuron 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.
Sources
Last updated 2026-09-30.