NDSU Extension - Mercer County


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Two Weeds Added to State Noxious Weed List

N.D. State Noxious Weed List, Palmer amaranth, houndstongue

Submitted by Craig Askim, Extension Agent/Agriculture and Natural Resources

It comes as no surprise that two weeds, Palmer amaranth and houndstongue have been added to the North Dakota State Noxious Weed List. I have been talking about these weeds for some time and now that they are on the state’s noxious weed list, landowners will be responsible for control by state law. I will explain how to identify these weeds and suggest some of the best control methods. These weeds will also be talked about at the Mercer County Crops Educational Day on January 31, at the Beulah Civic Center.

Palmer is a very aggressive weed that is in the pigweed family. It is similar in appearance to waterhemp, another very aggressive weed in the state. The true identification factor for Palmer is that the petioles are longer than the leaf, with the female plants having a spiny bract and diamond shaped leaves. Palmer can spread easily and germinate throughout the growing season unlike many other weeds. Palmer can grow three to four inches a day under favorable conditions and can get as tall as nine feet. To date, there is no post-applied herbicides available to control this weed, and pre-applied herbicides are very limited and only available for use in selected crops. This weed has been positively identified in five counties in North Dakota.

Houndstongue is a weed that has been found in Mercer County. It produces bur-like seeds and many are found in non-cropland areas, making it difficult to control. The problem is these bur-like seeds can become embedded in animals and even humans. Houndstongue can be toxic to animals if ingested.

If producers suspect they have discovered these weeds in the county, call me at the Extension office. All information will remain confidential. The only way to control these weeds is to get a correct identification and make sure control methods can be put in place. Silence is not an option because if these weeds are found on your property by weed control officers, government offices etc., you are subject to the penalties under the noxious weed laws.

For more information on these weeds go to www.nd.gov/ndda/plant-industries/noxious-weeds or call the Extension office at 701.873.5195.


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