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