FirstAct herbicide logo

Grass Control in DT Trait® Sorghum

The Herbicide Component of the Double Team System

FirstAct® herbicide from ADAMA is the required companion herbicide for approved DT Trait® sorghum hybrids. Applied postemergence according to the current label and trait-specific guidance, it controls labeled grass weeds while the DT Trait provides crop tolerance.
A white 2.5 gallon jug of FirstAct herbicide with the triangular "ADAMA" logo in borwn on the rigth side of the bottle.

What Does FirstAct Control?

FirstAct controls susceptible grass weeds listed on the label, including key species such as:

  • Foxtail
  • Barrnyardgrass
  • Crabgrass
  • Sandbur
  • Texas panicum
  • Labeled volunteer cereals.

Weed size, rate, environmental conditions and application quality affect performance. Use the current label as the governing source.

Sorghum rows with dead grass in the furrow

When Can FirstAct Be Applied?

Application timing depends on whether the planted hybrid contains DT1 or DT2. Confirm the trait before spraying, then use the current FirstAct label and Double Team Overview Brochure to determine crop stage, weed stage, rate, additives and restrictions. Do not infer timing from the Double Team name alone.

What About Broadleaf Weeds?

FirstAct is the grass-control component of the program. Plan broadleaf control separately and follow current label directions for tank mixes and intervals between applications. Consult your crop-protection retailer, crop consultant or ADAMA representative when building the full program.

Stewardship is Part of the Performance.

Use only FirstAct herbicide with approved DT Trait sorghum. Follow all technology-use, application and resistance-management requirements. Maintain field records that identify the hybrid, trait generation, application date, crop stage, weed stage, rate and additives.

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Grassy Weed Reference Chart

Grass Species% Yield ReductionSources
Johnson Grass100%Bean (1991)
Shattercane80-96%Stahlman and Wicks (2000), Original Veseckt et al (1973)
Longpine Sandbur42%Thompson, Dille, and Peterson (2017), Original Fabrizius (1998)
Yellow Foxtail44%Stahlman and Wicks (2000), Original (Feltner et al (1969b))
Barnyardgrass44%Stahlman and Wicks (2000), Original (B.A. Smith(1990))
Prairie Cupgrass42%Stahlman and Wicks (2000), Original (Stahlman and Northam (1992))
Texas and Brown Panicum80%Garcia et al (2019)

Seeding Rate

If planting in 20 inch rows or less always use the higher rates. Increase seeding rate by 20% if planting is delayed significantly to account for lower tillering rates.

Yield GoalSeed/acre
<80 bu/acre< 4,500 lbs/acre25-30,000
80-125 bu/acre4,000-5,600 lbs/acre40-55,000
125+ bu/acre7,000+ lbs/acre55-70,000
IrrigatedIrrigated80-120,000