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Resistant Palmer amaranth could ‘complicate’ seed corn production
University of Nebraska –Lincoln (UNL) greenhouse studies have confirmed a Palmer amaranth population resistant to postemergence application of atrazine and HPPD-inhibiting herbicides.
UNL weed science Extension educator Lowell Sandell says the resistant population was found in a seed corn production field in Fillmore County in southeast Nebraska. He says while it is an isolated incident, it is still a concern.
“Because the HPPD herbicides are a pretty important class of chemicals for postemergence broadleaf control, particularly in seed corn production—and that’s a pretty big industry in that part of the state,” says Sandell.
Weed management in seed corn production will be complicated with the evolution of atrazine and HPPD-resistant Palmer amaranth biotypes, Sandell says.
“(With) this population, glyphosate controls it very well,” he says, “But in seed corn production, quite often, glyphosate is not an option for postemergence control—and some of the best products for weed control in seed corn are HPPD products like Callisto, Laudis, Impact or Armezon.”
Sandell says it’s only the second time a Palmer amaranth population resistant to atrazine and the HPPD group of herbicides has been confirmed. The first discovery was in Kansas.
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