Herbicide label

Maestro 4EC

Maestro 4EC (EPA 71368-78) is a Group 6 bromoxynil herbicide labeled for 16 crops. The label lists 55 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

Maestro 4EC label facts

Crops on the Maestro 4EC label

Maestro 4EC is labeled for these 16 crops and uses, per the EPA label.

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Weeds on the Maestro 4EC label

The Maestro 4EC label names 76 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
  • sowthistle, annual
  • nightshade, black
  • mustard, blue
  • starbur, bristly
  • fiddleneck
  • cocklebur, common
  • lambsquarters, common
  • tarweed, common
  • nightshade, cutleaf
  • nightshade, eastern black
  • pennycress, field
  • smartweed, green
  • nightshade, hairy
  • jimsonweed
  • ladysthumb
  • sage, lanceleaf
  • smartweed, pennsylvania
  • pepperweed
  • shepherd's-purse
  • nightshade, silverleaf
  • buckwheat, tartary
  • sunflower
  • buckwheat, wild
  • buffalobur
  • burcucumber
  • cluster flower
  • groundsel, common
  • ragweed, common
  • chamomile, corn
  • gromwell, corn
  • cockle, cow
  • devilsclaw
  • ragweed, giant
  • sesbania, hemp
  • copperleaf, hophornbeam
  • morningglory, ivyleaf
  • knawel
  • kochia
  • rocket, london
  • morningglory, pitted
  • sunflower, prairie
  • knotweed, prostrate
  • puncturevine
  • pigweed, redroot
  • thistle, russian
  • pigweed, spiny
  • morningglory, tall
  • waterhemp, common
  • mustard, tumble
  • velvetleaf
  • mallow, venice
  • mustard, wild
  • radish, wild
  • croton, woolly
  • starthistle, yellow

Suppression

suppression2
  • mayweed
  • thistle, canada

Controls with a tank-mix partner

needs partner20
  • morningglory, entireleaf
  • horseweed
  • morningglory, palmleaf
  • pokeweed, common
  • sida, prickly
  • morningglory, purple
  • morningglory, smallflower
  • pigweed, smooth
  • spurge, toothed
  • bindweed, field
  • foxtail, giant
  • henbit
  • mustard, tansy
  • chickweed
  • thistle, canada
  • filaree, broadleaf
  • dogfennel
  • foxtail, green
  • wild oats
  • ryegrass, annual

Weed indexes featuring this label

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Maestro 4EC 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.

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Maestro 4EC FAQ

What weeds does Maestro 4EC control?

The Maestro 4EC label names 76 weeds, including annual sowthistle, black nightshade, blue mustard, bristly starbur, fiddleneck, and common cocklebur. Control varies by crop, rate, and timing.

What crops is Maestro 4EC labeled for?

Maestro 4EC is labeled for 16 crops and uses, including field corn, wheat, barley, sorghum, and alfalfa.

What is the active ingredient in Maestro 4EC? Is it a generic?

Maestro 4EC's active ingredient is bromoxynil (MOA Group 6). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.

Can I tank-mix Maestro 4EC?

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.