Herbicide label
Medal II ATZ Herbicide Label
Medal II ATZ (EPA 100-817) is a Group 5 and 15 atrazine and metolachlor herbicide labeled for 5 crops. The label lists 39 controlled weeds, plus partial-control, suppression, and partner-control categories.
“Medal II ATZ is a selective herbicide labeled for preplant, preemergence, or postemergence control of many annual grasses and broadleaf weeds in corn.”
Medal II ATZ label facts
- Product Medal II ATZ
- EPA Reg. No. 100-817
- Registrant Syngenta Crop Protection, LLC
- Active ingredient atrazine and metolachlor
- MOA group 5 and 15
Crops on the Medal II ATZ label
Medal II ATZ is labeled for these 5 crops and uses, per the EPA label.
Weeds on the Medal II ATZ label
The Medal II ATZ label names 50 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 control39- barnyardgrass, common
- carpetweed
- chickweed
- cocklebur, common
- crabgrass
- crowfootgrass
- cupgrass, prairie
- cupgrass, southwestern
- flixweed
- foxtail, giant
- foxtail, green
- foxtail, yellow
- galinsoga
- goosegrass
- henbit
- jimsonweed
- kochia
- lambsquarters
- foxtail, millet
- morningglory
- mustard
- nightshades
- nutsedge, yellow
- panicum, browntop
- panicum, fall
- pigweed
- purslane
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- red rice
- sida, prickly
- signalgrass
- smartweed
- velvetleaf
- waterhemp, common
- wheat, winter
- witchgrass
Partial control
partial6- cupgrass, woolly
- johnsongrass, seedling
- sandbur
- shattercane
- sicklepod
- sorghum, volunteer
Controls with a tank-mix partner
needs partner5- alfalfa
- bromegrass species
- orchardgrass
- cereal rye
- timothy
Medal II ATZ 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.
Medal II ATZ FAQ
What weeds does Medal II ATZ control?
The Medal II ATZ label names 50 weeds, including common barnyardgrass, carpetweed, chickweed, common cocklebur, crabgrass, and crowfootgrass. Control varies by crop, rate, and timing.
What crops is Medal II ATZ labeled for?
Medal II ATZ is labeled for 5 crops and uses, including field corn, sorghum, corn silage, sweet corn, and fallow.
What is the active ingredient in Medal II ATZ? Is it a generic?
Medal II ATZ's active ingredient is atrazine and metolachlor (MOA Group 5 and 15). 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.