Some US farmers are considering returning to conventional seed after increased pest resistance and crop failures meant genetically modified (GM) crops saw smaller yields globally than their non-GM counterparts.

"Farmers are paying extra for the technology but have seen yields which are no better than 10 years ago. They're starting to wonder why they're spending extra money on the technology," said economist Dan Basse, president of American agricultural research company AgResource.

(READ the story from Farmers Weekly)