Herbicide label
Flexstar GT 3.5
Flexstar GT 3.5 (EPA 100-1385) is a Group 9 and 14 fomesafen and glyphosate herbicide labeled for 2 crops. The label lists 79 controlled weeds, plus partial-control, suppression, and partner-control categories.
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Flexstar GT 3.5 label facts
- Product Flexstar GT 3.5
- EPA Reg. No. 100-1385
- Registrant Syngenta Crop Protection, LLC
- Active ingredient fomesafen and glyphosate
- MOA group 9 and 14
Crops on the Flexstar GT 3.5 label
Flexstar GT 3.5 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 Flexstar GT 3.5 label
The Flexstar GT 3.5 label names 81 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 control79- amaranth, palmer
- amaranth, spiny
- anoda, spurred
- barley
- barnyardgrass, common
- bluegrass, annual
- buttercup
- carpetweed
- chickweed, common
- chickweed, mouseear
- citronmelon
- cocklebur, common
- copperleaf, hophornbeam
- copperleaf, virginia
- corn, volunteer
- crabgrass
- crotalaria, showy
- croton, tropic
- deadnettle, purple
- eclipta
- eveningprimrose, cutleaf
- foxtail
- galinsoga
- goosegrass
- groundcherry, cutleaf
- henbit
- jimsonweed
- johnsongrass, seedling
- lambsquarters, common
- mallow, venice
- morningglory
- morningglory, cypressvine
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, palmleaf
- morningglory, pitted
- morningglory, purple moonflower
- morningglory, red
- morningglory, smallflower
- morningglory, tall
- mustard, wild
- nightshade, black
- nightshade, eastern black
- oats
- wild oats
- panicum, browntop
- panicum, fall
- panicum, texas
- pigweed, redroot
- pigweed, smooth
- poinsettia, wild
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- red rice
- redweed
- rocket, yellow
- rye, volunteer
- ryegrass, italian
- sesbania, hemp
- shattercane
- shepherd's-purse
- sicklepod
- sida, prickly
- signalgrass, broadleaf
- smartweed, ladysthumb
- smartweed, pennsylvania
- sprangletop
- spurge, prostrate
- spurge, spotted
- starbur, bristly
- sunflower, annual
- velvetleaf
- waterhemp, common
- volunteer wheat
- millet, wild-proso
- witchgrass
- cupgrass, woolly
Partial control
partial3- nightshade, hairy
- nutsedge, yellow
- ragweed, giant
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
Flexstar GT 3.5 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, the rotational crop, and your state, region, and rainfall — some intervals differ in AL, AR, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, and WV.
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 GT 3.5 FAQ
What weeds does Flexstar GT 3.5 control?
The Flexstar GT 3.5 label names 81 weeds, including palmer amaranth, spiny amaranth, spurred anoda, barley, common barnyardgrass, and annual bluegrass. Control varies by crop, rate, and timing.
What crops is Flexstar GT 3.5 labeled for?
Flexstar GT 3.5 is labeled for 2 crops and uses, including soybeans and cotton.
What is the active ingredient in Flexstar GT 3.5? Is it a generic?
Flexstar GT 3.5's active ingredient is fomesafen and glyphosate (MOA Group 9 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 Flexstar GT 3.5?
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 Flexstar GT 3.5?
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 Flexstar GT 3.5 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.