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A farmer in Oregon was puzzled when some wheat that had sprouted on his property wouldn't die after being sprayed with Roundup. After testing, the mystery was solved: The wheat was genetically modified by Monsanto, the same agri-giant that produces Roundup.

The discovery could cost the United States a significant part of its $8.1 billion in wheat exports. Officials from the Department of Agriculture are looking into whether modified wheat — which was tested in 16 states by Monsanto from 1998 to 2005 — has found its way into the food supply.

Officially, the FDA has declared genetically modified wheat crops safe for consumption. But that hasn't stopped them from being controversial. Concerns over the health and environmental effects of genetically modified crops have caused Michael Pollan acolytes to fight their spread into America's supermarkets.

And for America's export economy, it doesn't matter whether or not the FDA thinks modified crops are safe, because many U.S. trading partners don't.

There have already been casualties. Japan, which, along with Mexico, buys the bulk of American wheat, has canceled a tender offer to buy American white wheat.

"I won't be surprised if other countries start cancelling or reducing their purchases of U.S. wheat, particularly Asian countries, putting pressure on wheat demand," Joyce Liu, an investment analyst in Singapore, told Reuters.

The E.U. is planning to test incoming shipments of wheat from the United States and block any that contained genetically modified crops. Consumers in Europe are far more resistant to the idea of genetically modified crops than Americans, noted Michael Birnbaum at The Washington Post, with GMOs covering only 1 percent of E.U. farmland.

In the United States, crops grown primarily as animal feed are mostly genetically modified, including corn (88 percent) and soybeans (93 percent). Genetically modified wheat, however, isn't allowed in the United States or anywhere else in the world.