Herbicide label
IMPACTZ Herbicide Label
IMPACTZ (EPA 5481-612) is a Group 5 and 27 atrazine and topramezone herbicide labeled for 6 crops. The label lists 55 controlled weeds, plus partial-control, suppression, and partner-control categories.
“IMPACTZ is a combination of topramezone and atrazine (Group 5 and 27 Herbicides), and is absorbed by leaves, roots, and shoots and translocated to the growing points of sensitive weeds to provide control of emerged weeds.”
IMPACTZ label facts
- Product IMPACTZ
- EPA Reg. No. 5481-612
- Registrant Amvac Chemical Corporation
- Active ingredient atrazine and topramezone
- MOA group 5 and 27
Crops on the IMPACTZ label
IMPACTZ is labeled for these 6 crops and uses, per the EPA label.
Weeds on the IMPACTZ label
The IMPACTZ label names 59 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 control55- amaranth, palmer
- amaranth, powell
- barnyardgrass, common
- buckwheat, wild
- burcucumber
- volunteer canola
- carpetweed
- chickweed, common
- cocklebur, common
- crabgrass, large
- crabgrass, smooth
- cupgrass, woolly
- devil's-claw
- foxtail, giant
- foxtail, green
- foxtail, yellow
- galinsoga, hairy
- goosegrass
- henbit
- jimsonweed
- johnsongrass, seedling
- kochia
- ladysthumb
- lambsquarters, common
- prickly lettuce
- mallow, common
- mallow, venice
- horseweed
- millet, wild-proso
- morningglory, entireleaf
- morningglory, ivyleaf
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- panicum, fall
- panicum, texas
- pigweed, prostrate
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- purslane, common
- pusley, florida
- ragweed, common
- ragweed, giant
- sandbur, field
- shattercane
- shepherd's-purse
- sida, prickly
- signalgrass, broadleaf
- smartweed, pennsylvania
- sunflower, wild
- thistle, russian
- velvetleaf
- waterhemp, common
Partial control
partial4- bindweed, field
- dandelion
- rhizome johnsongrass
- thistle, canada
IMPACTZ 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.
IMPACTZ FAQ
What weeds does IMPACTZ control?
The IMPACTZ label names 59 weeds, including palmer amaranth, powell amaranth, common barnyardgrass, wild buckwheat, burcucumber, and volunteer canola. Control varies by crop, rate, and timing.
What crops is IMPACTZ labeled for?
IMPACTZ is labeled for 6 crops and uses, including field corn, corn silage, seed corn, popcorn, and sweet corn.
What is the active ingredient in IMPACTZ? Is it a generic?
IMPACTZ's active ingredient is atrazine and topramezone (MOA Group 5 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.