Herbicide label

IMPACT

IMPACT (EPA 5481-524) is a Group 27 topramezone herbicide labeled for 6 crops. The label lists 40 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“IMPACT is absorbed by leaves, roots, and shoots and translocated to the growing points of sensitive weeds to provide control of emerged weeds.”

— IMPACT EPA label, Reg. No. 5481-524

IMPACT label facts

Product IMPACT
EPA Reg. No. 5481-524
Registrant Amvac Chemical Corporation
Active ingredient topramezone
MOA group 27

Crops on the IMPACT label

IMPACT is labeled for these 6 crops and uses, per the EPA label.

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Weeds on the IMPACT label

The IMPACT 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 control40

amaranth, palmer
amaranth, powell
barnyardgrass, common
buckwheat, wild
volunteer canola
carpetweed
chickweed, common
cocklebur, common
crabgrass, large
crabgrass, smooth
cupgrass, woolly
foxtail, giant
foxtail, green
foxtail, yellow
galinsoga, hairy
goosegrass
henbit
jimsonweed
johnsongrass, seedling
lambsquarters, common
prickly lettuce
horseweed
millet, wild-proso
mustard, wild
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
sunflower, wild
thistle, russian
velvetleaf
waterhemp, common

Partial control

partial7

bindweed, field
dandelion
rhizome johnsongrass
purslane, common
sandbur, field
shattercane
thistle, canada

Controls with a tank-mix partner

needs partner12

burcucumber
devil's-claw
kochia
ladysthumb
mallow, common
mallow, venice
morningglory, entireleaf
morningglory, ivyleaf
panicum, texas
sida, prickly
signalgrass, broadleaf
smartweed, pennsylvania

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IMPACT 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 FAQ

What weeds does IMPACT control?

The IMPACT label names 59 weeds, including palmer amaranth, powell amaranth, common barnyardgrass, wild buckwheat, volunteer canola, and carpetweed. Control varies by crop, rate, and timing.

What crops is IMPACT labeled for?

IMPACT is labeled for 6 crops and uses, including field corn, corn silage, seed corn, popcorn, and sweet corn.

What is the active ingredient in IMPACT? Is it a generic?

IMPACT's active ingredient is topramezone (MOA Group 27). 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 IMPACT?

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.

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Can I tank-mix IMPACT?

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.