A rogue, illegal strain of genetically modified wheat was found in Oregon May 30. And its impact is already being felt on U.S. exports.
Japan canceled a bid on wheat grown in the Pacific Northwest May 31 in response to the discovery by an Oregon farmer. GMO crops are handled differently by different countries, and most countries don't sell any GMOs. Genetically modified wheat is not authorized to be grown or sold anywhere in the world.
South Korea also reacted negatively, suspending its tenders to buy U.S. wheat. Other countries said they wanted assurances that the crops they were receiving weren't genetically modified.
See the story at Grist.