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Glyphosate-resistant weeds

May 8, 2009
From Wayne Schoper, Brown/Nicollet Extension Educator

Glyphosate (Roundup) herbicide has been around for over 30 years and has proven to be an excellent choice for control of some very tough weeds. We used to have a lot of problems with perennial weeds such as Canadian thistle and Quackgrass. However, we don't see a lot of these weeds in row crop situations anymore once we bring glyphosate herbicide into the weed control program. Glyphosate is a non-selective herbicide, meaning it controls everything that it touches. In the early days, we would spray either before the crop was planted or as soon as the crop was harvested. Then in the early 1990's, scientists developed the technology to insert a gene that was resistant to glyphosate herbicide and the race was on to adopt this herbicide program for all of our crops that we plant in this area. In fact, most of the soybeans and a lot of the corn planted in southern Minnesota is "Roundup Ready" meaning that you can use glyphosate herbicide sprayed over the top and control all of the weeds in the field.



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