Herbicide label
OPTERO Herbicide Label
OPTERO (EPA 83100-58-83979) is a Group 15 and 27 acetochlor and mesotrione herbicide labeled for 4 crops. The label lists 79 controlled weeds, plus partial-control, suppression, and partner-control categories.
OPTERO label facts
- Product OPTERO
- EPA Reg. No. 83100-58-83979
- Distributor Rotam North America, Inc.
- Active ingredient acetochlor and mesotrione
- MOA group 15 and 27
Crops on the OPTERO label
OPTERO is labeled for these 4 crops and uses, per the EPA label.
Weeds on the OPTERO label
The OPTERO label names 96 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 control79- amaranth, palmer
- amaranth, powell
- amaranth, spiny
- atriplex
- barnyardgrass, common
- beans, volunteer
- beggarweed, florida
- buckwheat, wild
- buffalobur
- carpetweed
- chickweed, common
- clover species
- cocklebur, common
- crabgrass
- crabgrass, large
- crowfootgrass
- cupgrass, prairie
- cupgrass, southwestern
- deadnettle, purple
- devil's-claw
- foxtail, bristly
- foxtail, giant
- foxtail, green
- foxtail, robust (purple, white)
- foxtail, yellow
- galinsoga
- goosegrass
- groundcherry, annual
- groundcherry, cutleaf
- hemp
- henbit
- horsenettle
- horseweed
- jimsonweed
- kochia
- lambsquarters, common
- lentil, volunteer
- mallow, venice
- foxtail, millet
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, pitted
- morningglory, tall
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- nutsedge, yellow
- panicum, browntop
- panicum, fall
- pea, volunteer
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- pokeweed, common
- potatoes, volunteer
- puncturevine
- purslane, common
- pusley, florida
- radish, wild
- ragweed, common
- ragweed, giant
- red rice
- sesbania, hemp
- shepherd's-purse
- sida, prickly
- signalgrass, broadleaf
- signalgrass, narrowleaf
- smartweed, ladysthumb
- smartweed, pennsylvania
- volunteer soybean
- sprangletop, red
- starbur, bristly
- sunflower, annual
- thistle, canada
- velvetleaf
- waterhemp, common
- witchgrass
- wormwood, biennial
Partial control
partial17- alfalfa, volunteer (seedling)
- bedstraw, catchweed
- burcucumber
- carrot, wild
- cupgrass, woolly
- dandelion, common
- dock, curly
- johnsongrass, seedling
- knotweed, prostrate
- millet, wild-proso
- wild oats
- panicum, texas
- prickly lettuce
- sandbur, field
- shattercane
- sicklepod
- volunteer wheat
OPTERO 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.
OPTERO FAQ
What weeds does OPTERO control?
The OPTERO label names 96 weeds, including palmer amaranth, powell amaranth, spiny amaranth, atriplex, common barnyardgrass, and volunteer beans. Control varies by crop, rate, and timing.
What crops is OPTERO labeled for?
OPTERO is labeled for 4 crops and uses, including field corn, seed corn, corn silage, and popcorn.
What is the active ingredient in OPTERO? Is it a generic?
OPTERO's active ingredient is acetochlor and mesotrione (MOA Group 15 and 27). 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.