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How widespread are glyphosate-resistant weeds in the United States?

April 26, 2017glyphosate-resistant mindful mindfully mindfully.org united states weeds widespread

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How widespread are glyphosate-resistant weeds in the United States?

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August 27, 2005 A: The International Survey of Herbicide-Resistant Weeds indicates that, globally, 181species of herbicide-resistant weeds can be found in approximately 270,000 fields. The Survey also indicates that resistance to glyphosate has been confirmed in 7 weed species, 4 in the U.S. In addition, Monsanto and the University of Georgia are investigating a probable case of glyphosate-resistant Palmer pigweed (Palmer amaranth) in central Georgia. It is important to recognize that glyphosate-resistant species of greatest commercial significance in the U.S. are horseweed (marestail) (Conyza Canadensis), common ragweed (Ambrosia artemisiifolia) and rigid ryegrass (Lolium rigidum). University scientists estimate that glyphosate-resistant horseweed can be found in 729 – 2052 fields in 11 states. As of August 27, 2005, university estimates of the acreage affected by glyphosate-resistant horseweed range from 112,866 – 1,122,615 acres or much less than