Analysis: Super weeds pose growing threat to U.S. crops

Reuters: Farmer Mark Nelson bends down and yanks a four-foot-tall weed from his northeast Kansas soybean field. The "waterhemp" towers above his beans, sucking up the soil moisture and nutrients his beans need to grow well and reducing the ultimate yield. As he crumples the flowering end of the weed in his hand, Nelson grimaces. "When we harvest this field, these waterhemp seeds will spread all over kingdom come," he said. Nelson's struggle to control crop-choking weeds is being repeated all over America's......

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