Food and Farm Superweeds
This undated photo provided by Oregon State University shows a marestail weed. Weed scientists have been warning for more than a decade that a few sturdy species of weed are increasingly adapting to survive Roundup, the favorite weed-killer of corn, cotton and soybean farmers. Marestail in Illinois is one such weed. The ineffectiveness of the weed killer leads to the likelihood that farmers will use more chemicals in their fields and do more erosion-inducing plowing. (AP Photo/Oregon State University) NO SALES
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