Isolated fields of glyphosate-resistant weeds are likely showing up in Iowa. While absolute “certification” of field-wide glyphosate resistance weed populations is currently underway, the occurrence of glyphosate resistance was inevitable – certain members of any weed population have the genetics to fight whatever strategy is used against them. The occurrence of isolated glyphosate resistant common waterhemp plants in Iowa was documented in 1998.
Iowa State University
Owen, Michael D., "Glyphosate Stewardship Guide Available" (2009). Integrated Crop Management News. 700.
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