Now is a great time to scout for Palmer amaranth (Amaranthus palmeri) in Iowa cropfields. As of late 2018, this species had been identified in over half of Iowa’s 99 counties.While new identifications have waned since the widespread introductions in 2016, Palmeramaranth is a species to watch out for in virtually any Iowa crop field. A native of theAmerican southwest, Palmer amaranth is more competitive than common waterhemp(Amaranthus tuberculatus), a pigweed native to Iowa. Both species are known for fastdevelopment of herbicide resistance, prolific seed production (>500,000 seeds/plantpossible), and prolonged emergence.
Iowa State University
Anderson, Meaghan J. B. and Hartzler, Robert G., "Scout Now for Palmer Amaranth" (2019). Integrated Crop Management News. 2575.
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