Palmer amaranth: the pest that doesn't pull any punches
First found in Rock Co. in 2011, waterhemp's pesky cousin is determined to become the biggest & badest weed known to WI corn & soy farmers.
This story is based on two open access publications published in 2022 by the UW-Madison Cropping Systems Weed Science Program. "Palmer amaranth (Amaranthus palmeri) adaptation to US Midwest agroecosystems" published in Frontiers in Agronomy & "Multiple resistance to imazethapyr, atrazine, and glyphosate in a recently introduced palmer amaranth (Amaranthus palmeri) Accession in Wisconsin" published in Weed Technology.
Author information for both manuscripts are included at the end of this document.
Where in Wisconsin have we documented Palmer amaranth?
Palmer was first identified by former UW-Madison Weed Scientist Dr. Vince Davis in Rock County in 2011.
Palmer amaranth distribution across Wisconsin totaling 14 counties across the state ( compared to 9 counties in 2018 ). Note: Just because your county isn't identified on this map does not mean that palmer isnt present.
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