Herbicide label
SMEAR Herbicide Label
SMEAR (EPA 83529-268) is a Group 10 and 27 glufosinate and topramezone herbicide labeled for 4 crops. The label lists 96 controlled weeds, plus partial-control, suppression, and partner-control categories.
“SMEAR is absorbed by plant foliage and controls weeds by inhibiting glutamine biosynthesis (Group 10) and carotenoid biosynthesis (Group 27).”
SMEAR label facts
- Product SMEAR
- EPA Reg. No. 83529-268
- Registrant Sharda USA LLC
- Active ingredient glufosinate and topramezone
- MOA group 10 and 27
Crops on the SMEAR label
SMEAR is labeled for these 4 crops and uses, per the EPA label.
Weeds on the SMEAR label
The SMEAR label names 100 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 control96- amaranth, palmer
- amaranth, powell
- barnyardgrass, common
- bedstraw, catchweed
- beggarweed, florida
- black medic
- bluegrass, annual
- blueweed, texas
- buckwheat, wild
- buffalobur
- burcucumber
- volunteer canola
- carpetweed
- chickweed, common
- cocklebur, common
- copperleaf, hophornbeam
- corn, volunteer
- cotton, volunteer
- crabgrass, large
- crabgrass, smooth
- croton, tropic
- croton, woolly
- cupgrass, woolly
- devil's-claw
- eclipta
- fleabane, annual
- foxtail, bristly
- foxtail, giant
- foxtail, green
- foxtail, robust purple
- foxtail, yellow
- galinsoga, hairy
- galinsoga, smallflower
- geranium, cutleaf
- goosegrass
- groundcherry, cutleaf
- hempnettle
- henbit
- horseweed
- jimsonweed
- johnsongrass, seedling
- junglerice
- knotweed
- kochia
- ladysthumb
- lambsquarters, common
- prickly lettuce
- mallow, common
- mallow, venice
- marshelder, annual
- millet, volunteer proso
- millet, wild-proso
- morningglory
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- wild oats
- panicum, fall
- panicum, texas
- pennycress, field
- pigweed, prostrate
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- puncturevine
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- red rice
- sandbur, field
- senna, coffee
- sesbania, hemp
- shattercane
- shepherd's-purse
- sicklepod
- sida, prickly
- signalgrass, broadleaf
- smartweed, pennsylvania
- smellmelon
- sorghum, volunteer
- sowthistle, annual
- volunteer soybean
- sprangletop
- spurge, prostrate
- spurge, spotted
- starbur, bristly
- stinkgrass
- sunflower
- sunflower, wild
- thistle, russian
- velvetleaf
- waterhemp, common
- volunteer wheat
- witchgrass
Suppression
suppression4- barley
- dandelion
- horsenettle
- thistle, canada
SMEAR 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.
SMEAR FAQ
What weeds does SMEAR control?
The SMEAR label names 100 weeds, including palmer amaranth, powell amaranth, common barnyardgrass, catchweed bedstraw, florida beggarweed, and black medic. Control varies by crop, rate, and timing.
What crops is SMEAR labeled for?
SMEAR is labeled for 4 crops and uses, including field corn, corn silage, sweet corn, and fallow.
What is the active ingredient in SMEAR? Is it a generic?
SMEAR's active ingredient is glufosinate and topramezone (MOA Group 10 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.