Herbicide label
Impact CORE Herbicide Label
Impact CORE (EPA 5481-648) is a Group 15 and 27 acetochlor and topramezone herbicide labeled for 4 crops. The label lists 46 controlled weeds, plus partial-control, suppression, and partner-control categories.
Impact CORE label facts
- Product Impact CORE
- EPA Reg. No. 5481-648
- Registrant Amvac Chemical Corporation
- Active ingredient acetochlor and topramezone
- MOA group 15 and 27
Crops on the Impact CORE label
Impact CORE is labeled for these 4 crops and uses, per the EPA label.
Weeds on the Impact CORE label
The Impact CORE label names 62 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 control46- amaranth, palmer
- amaranth, powell
- barnyardgrass, common
- burcucumber
- volunteer canola
- carpetweed
- chickweed, common
- cocklebur, common
- crabgrass, large
- crabgrass, smooth
- cupgrass, woolly
- foxtail, giant
- foxtail, green
- foxtail, yellow
- galinsoga, hairy
- goosegrass
- henbit
- horseweed
- jimsonweed
- johnsongrass, seedling
- kochia
- lambsquarters, common
- prickly lettuce
- mallow, common
- millet, wild-proso
- mustard spp.
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- panicum, fall
- pigweed, prostrate
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- pusley, florida
- ragweed, common
- ragweed, giant
- shepherd's-purse
- sida, prickly
- signalgrass, broadleaf
- smartweed, ladysthumb
- smartweed, pennsylvania
- sunflower, wild
- thistle, russian
- velvetleaf
- waterhemp, common
Partial control
partial16- beggarweed, florida
- cupgrass, prairie
- cupgrass, southwestern
- dandelion
- foxtail, millet
- morningglory
- mallow, venice
- wild oats
- panicum, browntop
- panicum, texas
- purslane, common
- red rice
- sandbur
- shattercane
- thistle, canada
- witchgrass
Impact CORE 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.
Impact CORE FAQ
What weeds does Impact CORE control?
The Impact CORE label names 62 weeds, including palmer amaranth, powell amaranth, common barnyardgrass, burcucumber, volunteer canola, and carpetweed. Control varies by crop, rate, and timing.
What crops is Impact CORE labeled for?
Impact CORE is labeled for 4 crops and uses, including field corn, corn silage, seed corn, and popcorn.
What is the active ingredient in Impact CORE? Is it a generic?
Impact CORE's active ingredient is acetochlor and topramezone (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.