Herbicide label

PETRA 4SC

PETRA 4SC (EPA 89168-48-91395) is a Group 14 sulfentrazone herbicide labeled for 21 crops. The label lists 88 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“Sulfentrazone the active ingredient in PETRA 4SC is a potent inhibitor of the enzyme Protoporphyrinogen Oxidase IX (PPO IX) required for the formation of chlorophyll Inhibition of PPO IX enzyme results in the liberation of singlet oxygen (0) that in turn disrupts cellular membranes and causes cellular leakage. The ultimate manifestation of the process is cellular death leading to plant death.”

— PETRA 4SC EPA label, Reg. No. 89168-48-91395

PETRA 4SC label facts

Crops on the PETRA 4SC label

PETRA 4SC is labeled for these 21 crops and uses, per the EPA label.

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Weeds on the PETRA 4SC label

The PETRA 4SC label names 88 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 control88
  • amaranth, livid
  • amaranth, palmer
  • amaranth, powell
  • amaranth, spiny
  • amaranth, spleen
  • anoda, spurred
  • bedstraw, catchweed
  • buckwheat, wild
  • cockle, white
  • carpetweed
  • chickweed, common
  • cocklebur, common
  • copperleaf, hophornbeam
  • copperleaf, virginia
  • crabgrass, large
  • crabgrass, smooth
  • crabgrass, southern
  • croton, tropic
  • crownbeard, golden
  • cupgrass, woolly
  • cyperus, hedgehog
  • daisy, american
  • devilsclaw
  • dock, curly
  • eclipta
  • filaree, redstem
  • flixweed
  • galinsoga, hairy
  • goosegrass
  • groundcherry, clammy
  • groundcherry, cutleaf
  • groundsel, common
  • jimsonweed
  • knotweed, prostrate
  • kochia
  • ladysthumb
  • lambsquarters, common
  • miner's lettuce
  • mallow, common
  • mayweed, chamomile
  • milkweed, honeyvine
  • morningglory, entireleaf
  • morningglory, ivyleaf
  • morningglory, palmleaf
  • morningglory, pitted
  • morningglory, purple
  • morningglory, red
  • morningglory, scarlet
  • morningglory, smallflower
  • morningglory, tall
  • mustard, tumble
  • nightshade, black
  • nightshade, eastern black
  • nutsedge, purple
  • nutsedge, yellow
  • orchardgrass
  • panicum, fall
  • pansy, field
  • pigweed, redroot
  • pigweed, smooth
  • pineapple-weed
  • plantain, blackseed
  • plantain, narrow-leaved
  • poinsettia, wild
  • poorjoe
  • porophyllum
  • purslane, common
  • redmaids
  • redweed
  • sedge, annual
  • senna, coffee
  • shepherd's-purse
  • sida, prickly
  • sida, southern
  • signalgrass, broadleaf
  • smartweed, pennsylvania
  • smellmelon
  • spurry, corn
  • starbur, bristly
  • starbur, prickly
  • stinkgrass
  • tassleflower, red
  • thistle, russian
  • toadflax, yellow
  • waterhemp, common
  • waterprimrose, winged
  • witchgrass
  • woodsorrel, yellow

Weed indexes featuring this label

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PETRA 4SC 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 and your soil texture.

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Plant-back and rotation

Your interval depends on your application rate, the rotational crop, and your state, region, and rainfall — some intervals differ in AL, CO, GA, ID, KS, MI, MN, MS, MT, NC, ND, NE, OR, SC, SD, TN, VA, WA, WI, and WY.

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PETRA 4SC FAQ

What weeds does PETRA 4SC control?

The PETRA 4SC label names 88 weeds, including livid amaranth, palmer amaranth, powell amaranth, spiny amaranth, spleen amaranth, and spurred anoda. Control varies by crop, rate, and timing.

What crops is PETRA 4SC labeled for?

PETRA 4SC is labeled for 21 crops and uses, including field corn, soybeans, sunflower, potato, and peanut.

What is the active ingredient in PETRA 4SC? Is it a generic?

PETRA 4SC's active ingredient is sulfentrazone (MOA Group 14). 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 PETRA 4SC?

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 PETRA 4SC?

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.

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Sources

Last updated 2026-07-14.