Herbicide label
Simazat 4L Herbicide Label
Simazat 4L (EPA 19713-171) is a Group 5 atrazine and simazine herbicide labeled for 2 crops. The label lists 28 controlled weeds, plus partial-control, suppression, and partner-control categories.
Simazat 4L label facts
- Product Simazat 4L
- EPA Reg. No. 19713-171
- Registrant Drexel Chemical Company
- Active ingredient atrazine and simazine
- MOA group 5
Crops on the Simazat 4L label
Simazat 4L is labeled for these 2 crops and uses, per the EPA label.
Weeds on the Simazat 4L label
The Simazat 4L label names 28 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 control28- bluegrass, annual
- brome, downy
- buckwheat, wild
- carpetweed
- chickweed, common
- cocklebur, common
- crabgrass
- foxtail
- henbit
- jimsonweed
- kochia
- lambsquarters
- morning glory, annual
- mustards
- nightshade, black
- panicum, fall
- pigweed
- purslane
- quackgrass
- ragweed, giant
- shepherd's-purse
- smartweed
- tansymustard
- thistle, russian
- velvetleaf
- wild lettuce
- mustard, wild
- wild sunflower
Simazat 4L 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.
Simazat 4L FAQ
What weeds does Simazat 4L control?
The Simazat 4L label names 28 weeds, including annual bluegrass, downy brome, wild buckwheat, carpetweed, common chickweed, and common cocklebur. Control varies by crop, rate, and timing.
What crops is Simazat 4L labeled for?
Simazat 4L is labeled for 2 crops and uses, including field corn and sweet corn.
What is the active ingredient in Simazat 4L? Is it a generic?
Simazat 4L's active ingredient is atrazine and simazine (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.