Palmer amaranth: a growing threat to yield

Palmer amaranth is a unique weed species that can cause serious problems for soybean producers.

Its rapid seed production and germination pattern that spans the entire growing season make Palmer amaranth one of a kind, says Joe Armstrong, field scientist, Dow AgroSciences. As a result, this highly competitive and aggressive pigweed species can cause significant yield reductions when it emerges before or with the crop.

“Palmer amaranth is a serious threat to corn and soybean fields, and growers should know how to spot it as well as what type of control methods to use,” he says. “Scout for it in its immature form throughout the season. If growers find Palmer amaranth in their field, take steps to control it immediately, before it’s too late.”

Given the threat Palmer amaranth poses to yield, the key to mitigating it is early control — before the crop emerges and when the weed is small. Growers should implement a season-long management plan using residual herbicides with multiple modes of action to prevent Palmer amaranth seeds from spreading.

For Palmer amaranth control in soybean fields, Armstrong recommends growers use a preemergence herbicide such as Sonic® or Surveil® herbicide. Sonic has two modes of action to control weeds when they are small, effectively managing Palmer amaranth and protecting soybean yield. Surveil features a double barrier of protection through two modes of action for residual control of tough weeds, including Palmer amaranth.

Learn more at or by contacting your local Dow AgroSciences sales representative.


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