Thu Jan 23, 2014 02:08 PM CST

(Dow Jones) -- U.S. grain industry groups are urging Syngenta AG to stop selling genetically engineered corn varieties that aren't approved in China, a key importer of U.S. grain.

The National Grain and Feed Association and North American Export Grain Association sent a joint statement Thursday requesting that Syngenta, a Swiss maker of agricultural products, halt sales of its biotechnology-enhanced Agrisure Viptera and Agrisure Duracade corn varieties until the Chinese government approves them for import.

China last month rejected at least 545,000 metric tons of U.S. corn that contained the Viptera variety, better known as MIR162, which has ...

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