Herbicide label
Bicep II Magnum
Bicep II Magnum (EPA 100-817) is a Group 5 and 15 atrazine and metolachlor herbicide labeled for 4 crops. The label lists 37 controlled weeds, plus partial-control, suppression, and partner-control categories.
Build the herbicide program for your field
Tell FieldMarshal your crop, weeds, and rotation. Get back a complete program, products, rates, plant-back, and tank-mix, with every line checked against the label so you can verify it yourself.
Built from 1,700+ EPA herbicide labels and 49 state weed-control guides. Made for crop advisors and growers.
Free to create your account. Every line references the label, so you can check it against the source.
“Bicep II Magnum is a selective herbicide labeled for preplant, preemergence, or postemergence control of many annual grasses and broadleaf weeds in corn.”
Bicep II Magnum label facts
- Product Bicep II Magnum
- EPA Reg. No. 100-817
- Registrant Syngenta Crop Protection, LLC
- Active ingredient atrazine and metolachlor
- MOA group 5 and 15
Crops on the Bicep II Magnum label
Bicep II Magnum is labeled for these 4 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 Bicep II Magnum label
The Bicep II Magnum label names 43 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 control37- 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
- millet, foxtail
- morningglory
- mustard
- nightshade, black
- nutsedge, yellow
- panicum, browntop
- panicum, fall
- pigweed
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- red rice
- sida, prickly
- signalgrass
- smartweed
- velvetleaf
- waterhemp, common
- witchgrass
Partial control
partial6- cupgrass, woolly
- johnsongrass, seedling
- sandbur
- shattercane
- sicklepod
- sorghum, volunteer
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
Bicep II Magnum 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 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 gives you the exact plant-back for your rotational crop from the label line.
Bicep II Magnum FAQ
What weeds does Bicep II Magnum control?
The Bicep II Magnum label names 43 weeds, including common barnyardgrass, carpetweed, chickweed, common cocklebur, crabgrass, and crowfootgrass. Control varies by crop, rate, and timing.
What crops is Bicep II Magnum labeled for?
Bicep II Magnum is labeled for 4 crops and uses, including field corn, sorghum, sweet corn, and fallow.
What is the active ingredient in Bicep II Magnum? Is it a generic?
Bicep II Magnum'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 Bicep II Magnum?
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 Bicep II Magnum?
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 Bicep II Magnum and let FieldMarshal build a defensible herbicide program for your field, every product, rate, and plant-back cross-referenced and checked against the label.
Free account and label filter. Building a program is paid, metered by use, so you pay only for what you build.
Sources
Last updated 2026-07-14.