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These Palmer amaranth — or pigweed — plants, seen growing in a greenhouse at Kansas State University, appear to be resistant to multiple herbicides. Dan Charles/NPR hide caption

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Dan Charles/NPR

As Weeds Outsmart The Latest Weedkillers, Farmers Are Running Out Of Easy Options

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Dewayne Johnson looks on after hearing the verdict in his case against Monsanto at the Superior Court Of California in San Francisco in August. Josh Edelson/AFP/Getty Images hide caption

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Josh Edelson/AFP/Getty Images

Last May, members of the Avaaz civic organization dressed as crop-sprayers in Brussels to protest the European Commission's plans to re-license glyphosate, the popular weed-killer sold by Monsanto under the brand name Roundup. John Thys/AFP/Getty Images hide caption

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John Thys/AFP/Getty Images

A central Illinois corn farmer refills his sprayer with the weedkiller glyphosate on a farm near Auburn, Ill. The pesticide has been the subject of intense international scrutiny. Seth Perlman/AP hide caption

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Seth Perlman/AP