Spread of Glyphosate Resistant Weeds
January 28, 2011| |
Bob Hartzler of the Department of Agronomy, Iowa State University, in partnership with other researchers conducted a study on the incidence of glyphosate resistant (GR) weeds. Results showed that three weed species: horseweed, waterhemp, and giant ragweed have been found to be infecting Iowa's corn and soybean fields. Hartzler described two distinct mechanisms in the development of herbicide resistance: "(1) independent selection of a resistant biotype from the weed community already present in the field and (2) the movement of the resistant trait (gene flow) from a field with an existing resistance problem to fields without resistance."
The report suggest that GR can still be prevented from appearing in crop fields through the use of diversified weed management systems that will provide a continuous and varied herbicide stresses on the weed community. Using this strategy will maintain the value of glyphosate by reducing the spread of GR weeds.
A thorough discussion on this can be seen at http://www.extension.iastate.edu/CropNews/2011/0120hartzler.htm.
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