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Waterhemp Increasing in North Dakota (08/13/15)

Even though much attention has been given to early detection of Palmer amaranth we should not forget about the ‘lesser evil’ – waterhemp.

Waterhemp Increasing in North Dakota

Even though much attention has been 13.wdsci.zollinger.2given to early detection of Palmer amaranth we should not forget about the ‘lesser evil’ – waterhemp. From phone calls this spring and summer it appears to have become well established in North Dakota east of Hwy 281. There may not be much yet in the northeast part of North Dakota but it continues to move north so with water movement which easily carries seed to new areas it may appear there at any time. Dr. Tom Peters found waterhemp by Grafton, ND and Dr. Kirk Howatt received pictures of waterhemp in the Cando, ND area indicating it is near the Canadian border. Greg Endres sent this photo below of waterhemp at the Carrington Research and Extension Center so it has now jumped across Hwy 281 and headed west.

Control measures for escaped waterhemp will not be effective at this time of year. Recommendations for control next year include an effective soil applied herbicide. Many are listed in the soybean section of the weed control guide. For more information on waterhemp, see Dr. Peter’s article below.

Rich Zollinger

Extension Weed Specialist

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