Finxray writes "Years of heavy use of the broad spectrum herbicide Roundup has led to the rapid growth of superweeds. They are spreading throughout North America, creating headaches for farmers and posing 'the single largest threat to production agriculture that we have ever seen,' according to Andrew Wargo III, the president of the Arkansas Association of Conservation Districts. From the article: 'The first resistant species to pose a serious threat to agriculture was spotted in a Delaware soybean field in 2000. Since then, the problem has spread, with 10 resistant species in at least 22 states infesting millions of acres, predominantly soybeans, cotton and corn. The superweeds could temper American agriculture’s enthusiasm for some genetically modified crops. Soybeans, corn and cotton that are engineered to survive spraying with Roundup have become standard in American fields. However, if Roundup doesn’t kill the weeds, farmers have little incentive to spend the extra money for the special seeds."