Misuse of weedkiller leads to signs of resistance

10/11/2005 | St. Louis Post-Dispatch

Two Missouri farmers of biotech soybeans have pigweed showing signs of resistance to Monsanto's Roundup herbicide after the growers did not vary their crops or weedkillers, as is recommended, a University of Missouri scientist said. Additional field studies will be conducted in 2006 to determine if the common waterhemp has developed resistance. Monsanto, whose herbicide is described in this news report as "one of the most effective, relatively safe and commonly used agricultural weedkillers" has created a Web site to educate farmers about avoiding weed resistance and how to handle it if it occurs.

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