National Sunflower Association - link home
About NSA Join NSA Contact Us Facebook YouTube
All About Sunflower


Health & Nutrition

Sunflower Seed and Kernel

Sunflower Oil


Banded Sunflower Moth

Sunflower Moth

Video Clips





Biennial Wormwood

Canada Thistle




Palmer Amaranth

Puncture Vine

Redroot Pigweed

Wild Buckwheat

Wild Sunflower

Weed Supplement

Approved Chemicals


Growth Stages


Production Resource Books


Yield Trials/Crop Survey

Crop Insurance

Equipment Buy/Sell

Calendar of Events

Media Center

Photo Gallery

Sunflower Statistics

International Marketing


Meal/Wholeseed Feeding

Sunflower Magazine



Daily Market News
Sign Up for Newsletter
Online Catalog
Online Directory
Google Search
Printer Friendly Version
You Are Here Growers > Weeds > Palmer Amaranth

Palmer Amaranth (Amaranthus palmeri)

Palmer Amaranth
This weed is showing up more often in the High Plains and was found to be the most common weed in Kansas sunflower fields in the 2008 NSA survey. Other common names for this weed are palmer pigweed and carelessweed. It is an erect annual that closely resembles other pigweed species. Of most concern is its development of ‘resistance' to Glyphosate (found in Georgia) and ALS herbicide resistance. This greatly complicates control in sunflower.

Control Strategies

Palmer Amaranth
1. Pre-plant burn down using Glyphosate tank mixed with products such as 2-4D and/or Aim to eliminate any Glyphosate resistant plants

2. Spartan has good to excellent activity on Palmer Amaranth

3. Sonalan, Trifluralin, Prowl are rated as fair to good

4. Both Beyond¹ and Express² have good to excellent activity but good stewardship must be practiced to reduce the potential of spreading ALS resistant plants

5. Between row cultivation or hooded sprayer herbicide application

Additional Links

Colorado Weed Management Guide (link)

Glyphosate, Weeds, and Crops (link)

KSU Weed Publications (link)

NDSU Crop Production and Marketing (link)

SDSU Weed Control in Oilseed Crops (link)

Sunflower labeled Herbicides (link)

Contact the chemical companies to obtain a copy of the label.


(1) Beyond herbicide is specific to CLEARFIELD® hybrids only. Clearfield hybrids have been developed with a resistant gene to Beyond herbicide. Applying Beyond herbicide on non-Clearfield hybrids will result in extensive damage.

(2) Express herbicide is specific to ExpressSun® hybrids only. ExpressSun hybrids have been developed with a resistant gene to Express herbicide. Applying Express herbicide on non-ExpressSun hybrids will result in extensive damage.

Glyphosate and Aim are labeled for between row hooded sprayer applications.

Top of the Page

copyright ©2016 National Sunflower Association