Palmer amaranth can reduce crop production and even hinder harvesting efforts due to rapid growth, aggressive competition, prolific seed production and germination throughout the season, according to the University of Arkansas Division of Agriculture.

Because these pigweed species adapt quickly to new environments, some populations have acquired resistance to many herbicides, increasing the challenge of controlling glyphosate-resistant pigweed. Glyphosate-resistant Palmer amaranth can spread rapidly through almost any field if it’s able to get a foothold early in the season.

The University of Arkansas Cooperative Extension recommends controlling Palmer amaranth by:

• Utilizing a preplant or pre-emergence residual herbicide
• Using good tillage practices to prepare the seedbed
• Spraying Palmer amaranth when it is small (3 in. above the ground)

Syngenta solution

For effective Palmer amaranth control in soybeans, Syngenta offers a variety of effective herbicides:

• BroadAxe®XC herbicide controls Palmer amaranth and a full range of tough broadleaf and grass weeds through broad-spectrum, long-lasting residual control.
• Boundary® soil-applied herbicide delivers early-season grass and broadleaf control, excellent resistance management and rotation flexibility. Containing two modes of action, Boundary can extend the post-emergence application window up to five weeks after planting, thereby protecting yield and keeping fields cleaner longer.
• For full-season weed control in glyphosate-tolerant (GT) soybeans, Boundary and BroadAxe XC can be followed by a timely post-emergence application of Flexstar® GT 3.5 herbicide, which controls the same annual weeds as glyphosate, as well as several glyphosate- and ALS-resistant broadleaf weed biotypes, such as Palmer amaranth.

Boundary, BroadAxe XC and Flexstar GT 3.5 eliminate weed competition, while helping to sustain soybean technology. Offering multiple different modes of action to control weeds, these brands, when combined with cultural practices such as crop rotation and tillage, help reduce the weed seed soil bank, maximize diversity and fight herbicide resistance.

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