How to Control Palmer Amaranth and Waterhemp in Cotton

When dealing with resistance issues with waterhemp and Palmer amaranth, it’s important to have a plan for your crop. Let's explore how to control these resistant weeds in your cotton crop.

Weed control options in cotton

There are many herbicide options to consider; below are suggested approaches for some common cotton cropping systems:

Glyphosate-tolerant Cotton

  • Spring Burndown
    Dicamba or 2,4-D + glyphosate or glufosinate + paraquat
  • Pre-Plant*1,3
    2,4-D + glyphosate or glufosinate + Reflex® + Group 15 herbicide2
  • Pre-Emerge**3
    Direx®, Cotoran® (if soil has been disturbed after spring burndown or pre-plant application) + Group 15 herbicide2
  • Post-Emerge***
    Glyphosate + Direx® (post directed spray) or Caparol® (post directed spray) + Group 15 herbicide2
  • Layby
    Glyphosate + Valor®, Caparol® Direx®, Layby™ Pro

LibertyLink® Cotton

  • Spring Burndown
    Dicamba or 2,4-D + glyphosate or glufosinate + paraquat
  • Pre-Plant*1,3
    2,4-D + glyphosate or glufosinate + Reflex® + Group 15 herbicide2
  • Pre-Emerge**3
    Direx®, Cotoran® (if soil has been disturbed after spring burndown or pre-plant application) + Group 15 herbicide2
  • Post-Emerge***
    Glyphosate + Direx® (post directed spray) or Caparol® (post directed spray) + Group 15 herbicide2
  • Layby
    Glyphosate + Valor®, Caparol® Direx®, Layby™ Pro

Enlist E3™ Cotton4

  • Spring Burndown
    Dicamba or 2,4-D + glyphosate or glufosinate + paraquat
  • Pre-Plant*1,3
    2,4-D + glyphosate or glufosinate + Reflex® + Group 15 herbicide2
  • Pre-Emerge**3
    Enlist One™ + Direx®, Cotoran® (if soil has been disturbed after spring burndown or pre-plant application) + Group 15 herbicide2
  • Post-Emerge***
    Enlist One™ + glufosinate or glyphosate + Direx® (post directed spray) + Group 15 herbicide2
  • Layby
    Enlist One™ + glufosinate or glyphosate, Valor®, Direx®

ExtendFlex® Cotton4

  • Spring Burndown
    Dicamba or 2,4-D + glyphosate or glufosinate + paraquat
  • Pre-Plant*1,3
    2,4-D + glyphosate or glufosinate + Reflex®
  • Pre-Emerge**3
    XtendiMax® + Direx®, Cotoran® (if soil has been disturbed after spring burndown or pre-plant application) + Group 15 herbicide2
  • Post-Emerge***
    XtendiMax® + glufosinate or glyphosate + Direx® (post directed spray) or Caparol® (post directed spray) + Group 15 herbicide2
  • Layby
    XtendiMax® + glufosinate or glyphosate + Valor®, Caparol®, Direx®

What to consider when developing your management plan

Keep in mind that your management plan should be developed for your specific weed pressures and any resistance issues present. Even when you observe herbicide resistance, remember that there is little chance that your particular weed will be resistant to all the mentioned groups. These herbicides continue to be important control options for many of the weeds we have in the U.S.

What is important is that you rotate your chemistries and crops to most effectively deal with these difficult to control species. ALWAYS READ AND FOLLOW LABEL INSTRUCTIONS. These chemical tables are not specific recommendations that apply to all fields. There is no expressed or implied guarantee of performance from any product listed above.

And, as always, consult your trusted FBN agronomist to design the best herbicide plan for your operation and talk to your FBN account executive about adjuvant options to maximize weed control.

Scout your fields with greater insights

Scouting your fields can give you a good idea of what pressures you're dealing with. You can up your scouting game utilizing precision maps and data specific to your farm and fields. Download our FBN Precision Mapping Guide to find out how.

FBN precision maps can help you evaluate your farm fields

ALWAYS READ AND FOLLOW LABEL DIRECTIONS. It is a violation of federal and state/provincial law to use any crop chemical product other than in accordance with its label. The distribution, sale and use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. It is your responsibility to confirm prior to purchase and use that a product is labeled for your specific purposes, including, but not limited to, your target crop or pest or weed, and its compatibility with other products in a tank mix.
 
* Pre-Plant: 14-21 days before planting
** Pre-Emerge: Before corn emergence up to 7 days before planting
*** Post-Emerge: 7-21 days after planting

1. Paraquat plus surfactant should be mixed with residual herbicides to control Palmer amaranth and waterhemp emerged before application.
2. Examples of Group 15 herbicides include: Dual® II Magnum, Degree®, Outlook®, Zidua®, or Anthem®
3. Some of these options may not be applicable due to the herbicide group resistance present.
4. With these systems, take note of approved tank mix status for any products used with these herbicide trait systems
 

Anthem® is a registered trademark of FMC Corporation. Valor®  is a registered trademark of Valent U.S.A. LLC Agricultural Products. Zidua®, LibertyLink® and Outlook® are registered trademarks of BASF Ag Products. Enlist E3™ cotton and Enlist One™ Herbicide with Colex D Technology are registered trademarks of Dow AgroSciences LLC. Reflex®, Caparol® and Dual® are registered trademarks of Syngenta Crop Protection, LLC. Degree®, XtendFlex™ and XtendiMax® With VaporGrip® Technology are registered trademarks of Monsanto Company. Direx® and Cotoran® are registered trademarks of ADAMA. Layby™ Pro Agricultural Herbicide is a registered trademark of Tessenderlo Kerley, Inc. (NovaSource).