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Two New Palmer Amaranth Infestations (09/23/21)


Two new infestations of Palmer amaranth have been confirmed in Grant and Sioux counties. Investigations are still ongoing, but it appears the findings are linked to contaminated sunflower screenings being fed to cattle, as both operations received sunflower screenings in early 2021 and Palmer amaranth was detected near the remaining piles of screenings. In one operation, Palmer could be found everywhere that feed rations were mixed and spread. Both sites still had some remaining sunflower screenings, and we were easily able to find pigweed seed in the piles of feed.


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Given the fact that Palmer amaranth infestations have been linked to sunflower screenings in at least 4 other counties in North Dakota, we are strongly encouraging anyone who purchased sunflower screenings for feed in the last 12 months to scout around their feed piles and feeding sites for Palmer amaranth plants. We also encourage everyone to continue scouting for potential Palmer amaranth infestations as we close out the summer and get ready to harvest the rest of our crops. Preventing seed production and seed rain in 2021 are some of the best tools we have to manage infestations beyond this year. If you find plants that you suspect are Palmer amaranth, please contact your county weed control officer, county Agent, local Area Extension Agronomist, Brian Jenks, or myself. Early detection will remain our best management tactic to prevent this weed from gaining a foothold in North Dakota.


Joe Ikley

Extension Weed Specialist