Herbicide label
Flexstar Herbicide Label
Flexstar (EPA 100-1101) is a Group 14 fomesafen herbicide labeled for 1 crops. The label lists 47 controlled weeds, plus partial-control, suppression, and partner-control categories.
“Flexstar is a selective herbicide which may be applied preplant, preemergence and/or postemergence for control or suppression of broadleaf weeds, grasses and sedges in soybeans.”
Flexstar label facts
- Product Flexstar
- EPA Reg. No. 100-1101
- Registrant Syngenta Crop Protection, LLC
- Active ingredient fomesafen
- MOA group 14
Crops on the Flexstar label
Flexstar is labeled for these 1 crops and uses, per the EPA label.
Weeds on the Flexstar label
The Flexstar label names 69 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
- anoda, spurred
- balloonvine
- carpetweed
- citron (wild watermelon)
- cocklebur, common
- copperleaf, hophornbeam
- copperleaf, virginia
- crotalaria, showy
- croton, tropic
- cucumber, volunteer
- eclipta
- groundcherry, cutleaf
- hemp
- jimsonweed
- ladysthumb
- mexicanweed
- morningglory, cypressvine
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, palmleaf
- morningglory, pitted
- morningglory, purple moonflower
- morningglory, red (scarlet)
- morningglory, smallflower
- morningglory, tall
- mustard, wild
- nightshade, black
- pigweed, redroot
- pigweed, smooth
- poinsettia, wild
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- sesbania, hemp
- sida, prickly
- smartweed, pennsylvania
- smellmelon
- starbur, bristly
- sunflower, annual
- velvetleaf
- mallow, venice
- waterhemp, common
- witchweed
- rocket, yellow
Suppression
suppression22- barnyardgrass, common
- bindweed, field
- bindweed, hedge
- signalgrass, broadleaf
- crabgrass
- foxtail, giant
- foxtail, green
- foxtail, yellow
- goosegrass
- horsenettle
- johnsongrass, seedling
- lambsquarters, common
- milkweed, climbing
- milkweed, honeyvine
- nutsedge, yellow
- panicum, fall
- panicum, texas
- redweed
- sicklepod
- spurge, prostrate
- spurge, spotted
- trumpetcreeper
Flexstar 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.
Flexstar FAQ
What weeds does Flexstar control?
The Flexstar label names 69 weeds, including palmer amaranth, spiny amaranth, spurred anoda, balloonvine, carpetweed, and citron (wild watermelon). Control varies by crop, rate, and timing.
What crops is Flexstar labeled for?
Flexstar is labeled for 1 crops and uses, including soybeans.
What is the active ingredient in Flexstar? Is it a generic?
Flexstar's active ingredient is fomesafen (MOA Group 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.