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You Are Here Growers > Approved Chemicals > Herbicides


AIM (Carfentrazone-ethyl)

Weeds Controlled
Controls small weeds less than 4 inches tall or rosettes less than 3 inches wide.

When to Apply
Used as a pre-plant or pre-emerge burn down as a stand-alone or tank mixed. Also labeled for hooded sprayer application between rows.

Tank mix with Glyphosate or paraquat for broad spectrum weed control.

Assert (imazamethabenz)

Weeds Controlled
Wild mustard

When to Apply
Post-emergence. Sunflower: less than eight leaves or 15 inches. Wild mustard: prior to bloom.

Sunflower injury may occur when applied at high temperature and humidity. Apply with NIS at 0.25% v/v.

Assure II and Targa (Quizalofop)

Weeds Controlled
Annual grasses and quackgrass

When to Apply
Postemergence. For most foxtail, apply when plants are 2-4 inches tall. For other grassy weeds, apply when plants are 2-6 inches

Remarks: Good control of quackgrass.

Beyond (Use on CLEARFIELD Sunflower)

Weeds Controlled
Wild beet, chickweed, cocklebur, jimsonweed, kochia*, lambsquarter, mustard spp., marshelder, nightshade, pigweed, puncturevine*, purslane,c.*, radish, w., smartweed, spurge, vol. sunflower, tansy mustard, velvetleaf, wild barley, barnyardgrass*, blackgrass, bromus, spp., canarygrass, crabgrass, spp.*, cupgrass, wooly*, darnel, persian, foxtail, spp., goosegrass, goatgrass, J., millet, proso, oats, wild, panicum spp., sandbur, field*, shattercane, signalgrass, stinkgrass, vol.cereals, witchgrass*
*asterisk indicates a sequential treatment of Prowl followed by Beyond is needed for complete control

When to Apply
Apply Beyond early postemergence from the V2 stage of growth up to and including the V8 growth stage.
Apply before broadleaf weeds exceed a height or width of 3". Apply before grass weeds exceed 4-5 leaves.

Beyond is part of the CLEARFIELD Production System for use on CLEARFIELD sunflower hybrids only

BroadAxe (sulfentrazone)

Weeds Controlled
Kochia, other broadleaves and grasses like foxtail

When to Apply

It is effective on both no-till and conventional till sunflower fields. It has a lower use rate compared to traditional grass pre herbicides and a flexible formulation for easy mixing with other herbicides. View the product label here online:
BroadAxe label.


Weeds Controlled
Grasses and some broad leaf weeds:
barnyardgrass red rice yellow nutsedge carpetweed
(watergrass) robust foxtails common waterhemp
bristly foxtail (purple, white) Eastern black nightshade
crabgrass signalgrass (Brachiaria) Florida pusley
crowfootgrass southwestern cupgrass galinsoga
fall panicum wild proso millet* pigweed
foxtail millet witchgrass Powell amaranth
giant foxtail woolly cupgrass* Palmer pigweed
goosegrass yellow foxtail tall waterhemp
green foxtail tropical spiderwort
prairie cupgrass

*Partial Control

When to Apply
Dual MAGNUM may be applied either as a preplant incorporated broadcast treatment or as a pre-emerge broadcast treatment. Apply 1-2 pts/A to soil and incorporate in top 3" using finishing disk, harrow, rolling cultivator, etc., within 14 days before planting. Do not bring untreated soil to surface with cultivation.
Premergence applications should be made at or shortly after planting but before weeds emerge. Dual MAGNUM will not control emerged weeds.

To avoid possible illegal residues: (1) Do not allow livestock to graze or feed in treated area. (2) Do not exceed the maximum label rates given
above for sunflowers for the soil type.

Eptam 7E (S-ethyl dipropylthiocarbamate)

Weeds Controlled
Annual Bluegrass, Annual Ryegrass, Barnyardgrass, Bermudagrass, Crabgrass, Giant Foxtail, Goosegrass, Green Foxtail, Johnsongrass, Lovegrass, Fall Panicum, Texas Panicum*, Rescuegrass, Field Sandbur, Shattercane**, Signalgrass, Volunteer Grains*, Wild Oats*, Witchgrass*, Yellow Foxtail
*May not be controlled at less than 3 1/2 pints of EPTAM 7E per acre.
**May not be controlled at less than 7 pints of EPTAM 7E per acre.

Tall Morningglory, Black Nightshade*, Carpetweed, Common Chickweed, Corn Spurry, Cutleaf Nightshade*, Deadnettle, Fiddleneck, Florida Pusley, Hairy Nightshade*, Common Lambsquarters*, Nettleleaf Goosefoot, Common Purslane, Prostrate Pigweed*, Prickly Sida*, Redroot Pigweed*, Sicklepod, Tumble Pigweed

The annual broadleaf weeds listed above will be controlled only if treatment is made when conditions are favorable for weed germination and growth.
Broadleaf weeds may only be suppressed at less than 3 1/2 pints EPTAM 7E per acre in heavier soils or under very cold soil conditions.
*May not be controlled at less than 4 1/2 pints of EPTAM 7E per acre.

When to Apply
The new supplemental label directs post-emergent use after the V2 stage and prior to R1 reproductive stage and not after the sunflower plant has reached 8 inches in height.

Eptam 7E may be used as a postemergence application in sunflower. The post application is best suited with irrigation water. For more information go to


Weeds Controlled
Broadleaf weeds controlled or suppressed:
Buckwheat, wild*
Chamomile, mayweed
Chamomile, wild
Chickweed, common
Falseflax, smallseed
Lambsquarters: common, slimleaf
Lettuce, miner's
Lettuce, prickly**
Mustard: black, blue (purple
mustard), wild
Nightshade, hairy*
Pennycress, field
Pigweed, redroot
Purslane, common
Smartweed, Pennsylvania*
Sowthistle, annual*
Thistle: Canada, Russian**
Vetch*: common, hairy
Wallflower, bushy (treacle mustard)
Condensed list of broadleaf weeds controlled or suppressed
* Partially controlled weeds exhibit a visual reduction in numbers as well as a significant
loss of vigor.
** Resistant biotypes were not always adequately controlled.

When to Apply
Apply EXPRESS when the ExpressSun sunflowers are in the 1 leaf stage of growth but prior to beginning of bud formation.

Temporary crop yellowing may be observed shortly after application of Express. For use on sunflower hybrids with the DuPont ExpressSun Trait for tolerance to DuPont Express herbicide with Totalsol Soluable Granules. See label for more details.


Weeds Controlled
Emerged grass and broadleaf

When to Apply
Preplant or anytime prior to crop emergence.

Nonselective, nonresidual, systemic, foliar herbicide. Apply with AMS fertilizer. Refer to label for adjuvant use.

Paraquat (weed control)

Weeds Contolled
Emerged annual grasses and broadleaf weeds.

When to Apply
Preplant or anytime prior to crop emergence.

Nonselective, nonresidual, foliar herbicide. Apply with nonionic surfactant (NIS) at 0.12 to 0.25% v/v. Good coverage is essential. A residual herbicide may be tank-mixed with paraquat.

Poast (sethoxydim)

Weeds Controlled
Annual grasses

When to Apply
Post-emergence. Grass: two to six inches tall.

Apply with oil adjuvant at 1 qt./acre to actively growing weeds. Allow 70-day preharvest interval.

Prowl Pendimax (pendimethalin)
Weeds Controlled
Grass and some broadleaf weeds

When to Apply
Preplant incorporated

Poor on wild mustard and wild oat. Adjust rate according to soil type. May be tank mixed with Eptam.

Select, Prism (clethodim) or Arrow 2EC

Weeds Controlled
Annual grasses and quackgrass

When to Apply
Postemergence. Grass: 2 to 6 inches tall

Registration recently approved for Select, Prism. Apply with oil adjuvant a 1 qt./acre to actively growing weeds. Allow a 70-day PHI. Makhteshim-Agen of North America is the registrant for Arrow 2EC.

Sonalan (ethalfluralin)

Weeds Controlled
Good to excellent control of: Barnyardgrass, green and yellow foxtail, field sandbur, Lambsquarters, redroot pigweed, Russian thistle
Suppression: Kochia

For use in reduced or conservation tillage. Incorporate twice at two- to three-inch depth using V-blade, undercutter, or rotary hoe. For fall applications, incorporate one in the fall and once in the spring prior to seeding.

Sonalan + Eptam (ethalfluralin + EPTC)
Weeds Controlled
Grass and some broadleaf weeds

When to Apply
Preplant incorporated

Adjust rate according to soil type and organic matter, PPI immediately after application. Poor on mustard.

Spartan (sulfentrazone)

Weeds Controlled
Annual small-seeded broadleaf weeds, including kochia, pigweed, lambsquarter, morningglory, nightshade, palmer amaranth, redstem filaree, Russian thistle, sida waterhemp, and biennial wormwood

When to Apply
Early preplant; preplant incorporated; or pre-emergence

Make EPP application up to 30 days prior to planting. Adjust rate to soil type. Requires precipitation for activation. Provide adequate furrow closure at planting. Temporary sunflower injury may occur in coarse, low-organic-matter soils with pH greater than 8.0. May give six to eight weeks of residual weed control.


Weeds Controlled
Good to excellent control of: Barnyardgrass, green and yellow foxtail, field sandbur, Lambsquarters, redroot pigweed, Russian thistle
Suppression: Kochia

When to Apply
Preplant incorporated Fall, PPI after Sept. 1; or spring

Poor wild mustard and wild oat control. PPI within 24 hours after application. May be tank-mixed with Eptam.

Trifluralin + Eptam (EPTC)

Weeds Controlled
Grass and some broadleaf weeds

When to Apply
Preplant incorporated

Enhances wild oat and reduces potential carryover or trifluralin

Valor® SX Herbicide

Weeds Controlled
Valor provides little postemergence weed control
Chamomile: False, Cheatgrass, Chickweed: Common & Mouseear, Cockle: White, Dandelion, Deadnettle: Purple, Groundsel: Cressleaf, Henbit, Kochia, Marestail/Horseweed, Mallow: Common, Prickley Lettuce, Wormwood: Biennial. Canola: Volunteer, Carolina Geranium, Eveningprimrose: Cutleaf, Flixweed, Mustard: Tansy& Wild, Shepherd's-purse.

When to Apply
Fall burndown program Valor can't be used preemergence in Sunflowers

Valor can be used at 3 - 4 oz/Acre with labeled burndown herbicides to enhance the speed of burndown, increase weed spectrum and provide residual weed control until the following spring. Valor should be mixed with 2, 4-D and/or glyphosate formulations labeled for burndown programs (pre-emergence to crop). Do not perform any tillage operation after application or residual weed control will be reduced. Additional preemergence herbicides should be applied at planting and postemergence herbicides in-crop should be planned to achieve optimum weed control.

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