Herbicide label
Synex 4 L Herbicide Label
Synex 4 L (EPA 91234-323) is a Group 5 linuron herbicide labeled for 6 crops. The label lists 56 controlled weeds, plus partial-control, suppression, and partner-control categories.
Synex 4 L label facts
- Product Synex 4 L
- EPA Reg. No. 91234-323
- Registrant Atticus, LLC
- Active ingredient linuron
- MOA group 5
Crops on the Synex 4 L label
Synex 4 L is labeled for these 6 crops and uses, per the EPA label.
Weeds on the Synex 4 L label
The Synex 4 L label names 63 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 control56- amaranth, palmer
- aster, white heath
- barnyardgrass, common
- beggarweed, florida
- buckwheat, wild
- canarygrass
- carpetweed
- chickweed, common
- chickweed, mouseear
- cocklebur, common
- crabgrass, large
- deadnettle, purple
- dayflower, common
- dog fennel
- evening-primrose, cutleaf
- rattail fescue
- fiddleneck
- foxtail, green
- foxtail, yellow
- galinsoga
- goosefoot, nettleleaf
- goosegrass
- groundsel, common
- henbit
- knawel
- kochia
- lambsquarters
- morningglory, entire leaf
- morningglory, ivy leaf
- morningglory, pitted
- mustard, blue
- mustard, tumble
- mustard, wallflower
- panicum, fall
- panicum, texas
- pennycress, field
- pigweed, prostrate
- pigweed, redroot
- pigweed, smooth
- prickly lettuce
- purslane, common
- radish, wild
- ragweed, common
- ryegrass, annual
- sesbania, hemp
- shepherd's-purse
- sicklepod
- sida, prickly
- signalgrass, broadleaf
- smartweed, pennsylvania
- speedwell, corn
- speedwell, field
- tansymustard, pinnate
- velvetleaf
- wallflower, bushy
- waterhemp, common
Partial control
partial6- crabgrass, smooth
- foxtail, giant
- morning glory, annual
- nightshade, eastern black
- pusley, florida
- ragweed, giant
Controls with a tank-mix partner
needs partner1- nutsedge
Synex 4 L 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.
Synex 4 L FAQ
What weeds does Synex 4 L control?
The Synex 4 L label names 63 weeds, including palmer amaranth, white heath aster, common barnyardgrass, florida beggarweed, wild buckwheat, and canarygrass. Control varies by crop, rate, and timing.
What crops is Synex 4 L labeled for?
Synex 4 L is labeled for 6 crops and uses, including field corn, soybeans, wheat, cotton, and potato.
What is the active ingredient in Synex 4 L? Is it a generic?
Synex 4 L's active ingredient is linuron (MOA Group 5). 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.