Components and Ratios of Pre-mix Herbicides for Use in Soybean

March 2017


Many herbicide options for soybean comprise multiple herbicide active ingredients to broaden the spectrum of weed species the product will control. Herbicides are also combined to include additional herbicide modes of action so that development of herbicide-resistant weeds can be prevented or delayed.  Knowing the amount of the individual herbicides in the pre-mix is useful for deciding if additional product should be applied to further improve weed control.
The following table lists several pre-mix herbicides that are labeled for use in soybean and the equivalent rates of the individual herbicide components.  Use rates for pre-mix herbicides are based on label recommendations for medium texture soils with 1.5 percent organic matter and pH of 6.5.  Use rates can vary depending on soil characteristics and planned follow-up herbicide applications.  Before using any herbicide, always consult the label for appropriate rates, tank-mix partners, plant-back intervals, geographic restrictions, and other special instructions.

Pre-mix herbicide (manufacturer)Use rate per acreComponent herbicides Equivalent rates
(per acre)
Herbicide Mode of Action
*All equivalent rates of glyphosate are based on a 3 lb. acid equivalent per gallon formulation.
Authority Assist (FMC)5 fl ozAuthority DF
Pursuit DG
2.22 oz
0.6 oz
PPO inhibitor
ALS inhibitor
Authority MTZ (FMC)10 ozAuthority DF
Sencor
2.4 oz
3.6 oz
PPO inhibitor
PS II inhibitor
Authority First DF (FMC)3 ozAuthority DF
FirstRate
2.5 oz
0.2 oz
PPO inhibitor
ALS inhibitor
Authority XL (FMC)4 ozAuthority DF
Classic
3.32 oz
1.25 oz
PPO inhibitor
ALS inhibitor
Boundary (Syngenta)1.5 ptDual Magnum
Sencor
1 pt
5 oz
Shoot inhibitor
PS II inhibitor
Canopy (DuPont)3 ozClassic
Sencor
1.28 oz
2.57 oz
ALS inhibitor
PS II inhibitor
Canopy EX (DuPont)1.5 ozClassic
Express 50 SG
1.36 oz
0.20 oz
ALS inhibitor
ALS inhibitor
Envive (DuPont)3.5 ozClassic
Valor SX
Harmony 50 SG
1.29 oz
2.00 oz
0.20 oz
ALS inhibitor
PPO inhibitor
ALS inhibitor
Extreme (BASF)3 ptPursuit DG
glyphosate (3 lb ae)*
1.4 oz
24 fl oz
ALS inhibitor
glyphosate
Flexstar GT (Syngenta)
For use east of US-75 only
3 ptReflex
glyphosate (3 lb ae)*
1 pt
41.6 fl oz
PPO inhibitor
glyphosate
Gangster (Valent)3.6 oz co-packValor
FirstRate
3 oz
0.6 oz
PPO inhibitor
ALS inhibitor
OpTill (BASF)2 ozSharpen
Pursuit DG
1 oz
1.4 oz
PPO inhibitor
ALS inhibitor
Prefix (Syngenta)
For use east of US-75 only
2 ptReflex
Dual Magnum
1 pt
1 pt
PPO inhibitor
Shoot inhibitor
Pursuit Plus (BASF)2.5 ptPursuit DG
Prowl H2O
4 oz
1.78 pt
ALS inhibitor
Root inhibitor
Rage D-Tech (FMC)12 fl ozAim EC
2,4-D ester (4 lb)
0.78 fl oz
12.5 fl oz
PPO inhibitor
Growth regulator
Sequence (Syngenta)2.5 ptDual Magnum
glyphosate (3 lb ae)*
0.98 pt
30 fl oz
Shoot inhibitor
glyphosate
Sonic (Dow)3 ozAuthority DF
FirstRate
2.5 oz
0.2 oz
PPO inhibitor
ALS inhibitor
Spartan Advance (FMC)32 fl ozSpartan 4L
glyphosate (3 lb ae)*
4.5 fl oz
24 fl oz
PPO inhibitor
glyphosate
Synchrony XP (DuPont)0.75 ozClassic
Harmony 50 SG
0.64 oz
0.10 oz
ALS inhibitor
ALS inhibitor
Valor XLT (Valent)3 ozValor SX
Classic
1.77 oz
1.24 oz
PPO inhibitor
ALS inhibitor
Verdict (BASF)5 fl ozSharpen
Outlook
1 fl oz
4.17 fl oz
PPO inhibitor
Shoot inhibitor

 

Abbreviations:
oz = ounce        ae = acid equivalent
fl oz = fluid ounce        DF = dry flowable
pt = pint        DG = dry granule
qt = quart         EC = emulsifiable concentrate
lb = pound        SG =  soluble granule

Additional resources
For more information on herbicide modes of action, please see OSU Extension Fact Sheet PSS-2778 “Understanding Herbicide Mode of Action.”

Misha Manuchehri
Extension Weed Science Specialist

 

DASNR Extension Research CASNR
OCES  Contact
OCES
139 Agricultural Hall
Oklahoma State University
Stillwater, OK 74078
OKLAHOMA STATE UNIVERSITY