Two leading U.S. grain groups have asked Syngenta to halt commercialization in the United States of two genetically modified (GM) strains of corn not currently approved in China.

The National Grain and Feed Association and North American Export Grain Association asked Syngenta to hold back on its Agrisure Viptera and Duracade corn varieties until China and other U.S. markets have granted regulatory approval.

The move came after multiple cargoes of U.S. corn were rejected by Chinese authorities since November because they contained Syngenta’s Agrisure Viptera GM trait, known as MIR 162, which has been awaiting Beijing’s acceptance for more than two years. Viptera received U.S. approval in 2010 and Duracade was approved in February 2013.

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