Herbicide label
Medal II ATZ
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.
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“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.
- field corn
- sorghum
- corn silage
- sweet corn
- fallow
Need the rate or timing for one of these? Filter every label by your crop, free.
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
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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 and your soil texture.
Get the rate for your field: build a program and FieldMarshal cites the exact per-acre rate for your crop to 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 CO, DE, IA, IL, IN, KS, KY, MD, MI, MN, MO, MT, ND, NE, NY, OH, PA, SD, TN, TX, VA, WI, WV, and WY.
Get the interval for your rotation: build a program and FieldMarshal cites the exact plant-back for your rotational crop to 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.
What's the plant-back interval after Medal II ATZ?
It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal cites the exact interval for your rotation to the label line, so you can verify it.
Build a program →Can I tank-mix Medal II ATZ?
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 cites the condition on each, so you can verify it.
Build a program →Plan in minutes, not evenings.
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Sources
Last updated 2026-07-10.