University of Nebraska-Lincoln greenhouse studies have confirmed a Palmer amaranth population resistant to postemergence application of atrazine and HPPD-inhibiting herbicides (Callisto, Laudis, Armezon/Impact).
The resistant population was found in seed corn field in Fillmore County in southeast Nebraska. It’s the second report—the first coming from Kansas—of a Palmer amaranth population resistant to atrazine and the HPPD group of herbicides.
Brownfield discussed the significance of the find with UNL weed science Extension educator Lowell Sandell.
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