Herbicide label

Harmony Extra SG

Harmony Extra SG (EPA 352-714) is a Group 2 thifensulfuron and tribenuron-methyl herbicide labeled for 9 crops. The label lists 75 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“HARMONY® EXTRA SG is absorbed primarily through the foliage of plants, rapidly inhibiting the growth of susceptible weeds.”

— Harmony Extra SG EPA label, Reg. No. 352-714

Harmony Extra SG label facts

Crops on the Harmony Extra SG label

Harmony Extra SG is labeled for these 9 crops and uses, per the EPA label.

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Weeds on the Harmony Extra SG label

The Harmony Extra SG label names 84 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 control75
  • knawel, annual
  • sowthistle, annual
  • mustard, black
  • mustard, blue
  • mustard, purple
  • dock, broadleaf
  • buttercup, bur
  • wallflower, bushy
  • mustard, treacle
  • pepperweed, clasping
  • fiddleneck
  • buckwheat, common
  • chickweed, common
  • cocklebur, common
  • groundsel, common
  • lambsquarters, common
  • radish, common
  • ragweed, common
  • sunflower, annual
  • chamomile, corn
  • gromwell, corn
  • spurry, corn
  • cowcockle
  • cress, mouse-ear
  • dock, curly
  • chamomile, false
  • chickweed, field
  • pennycress, field
  • filaree, redstem
  • filaree, Texas
  • flixweed
  • smartweed, green
  • henbit
  • hempnettle
  • kochia
  • ladysthumb
  • rocket, london
  • marshelder
  • mayweed, chamomile
  • miner's lettuce
  • lambsquarters, narrowleaf
  • catchfly, nightflowering
  • smartweed, pennsylvania
  • pineapple-weed
  • prickly lettuce
  • knotweed, prostrate
  • pigweed, prostrate
  • redmaids
  • pigweed, redroot
  • thistle, russian
  • chamomile, scentless
  • mayweed
  • shepherd's-purse
  • lambsquarters, slimleaf
  • buttercup, smallflower
  • falseflax, smallseed
  • chickweed, stinking
  • mayweed, stinking
  • dogfennel
  • swinecress
  • tansymustard
  • fiddleneck, tarweed
  • mustard, tumble
  • mustard, Jim Hill
  • lentil, volunteer
  • pea, volunteer
  • sunflower, volunteer
  • buckwheat, wild
  • chamomile, wild
  • garlic, wild
  • mustard, wild
  • radish, wild
  • thistle, canada
  • vetch
  • vetch, hairy

Suppression

suppression8
  • carolina geranium
  • bedstraw, catchweed
  • eveningprimrose, cutleaf
  • dandelion
  • mallow, common
  • mallow, little
  • nightshade, cutleaf
  • nightshade, hairy

Controls with a tank-mix partner

needs partner1
  • sage, lanceleaf

Weed indexes featuring this label

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Harmony Extra SG 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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Plant-back and rotation

Your interval depends on your application rate, the rotational crop, and your state, region, and rainfall — some intervals differ in ID, OR, and WA.

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.

Harmony Extra SG FAQ

What weeds does Harmony Extra SG control?

The Harmony Extra SG label names 84 weeds, including annual knawel, annual sowthistle, black mustard, blue mustard, purple mustard, and broadleaf dock. Control varies by crop, rate, and timing.

What crops is Harmony Extra SG labeled for?

Harmony Extra SG is labeled for 9 crops and uses, including field corn, soybeans, wheat, cotton, and barley.

What is the active ingredient in Harmony Extra SG? Is it a generic?

Harmony Extra SG's active ingredient is thifensulfuron and tribenuron-methyl (MOA Group 2). 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 Harmony Extra SG?

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 Harmony Extra SG?

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.

Other registrations of Harmony Extra SG