Archer Daniels Midland, one of the largest purchasers of soybeans and corn in the United States, last week urged its suppliers to segregate non-genetically modified crops.

ADM said the move, which represents a sharp reversal in its stance on GM crops, is based on high demand for non-GM crops overseas. In a letter to suppliers last week, the company said that it "remains supportive of the science and safety of both biotech development and traditional plant breeding methods to improve crops and benefit