The move, supported by farmers, ecologists and consumer groups, will force the government to impose a blanket ban on the cultivation of GMO crops and the import of animals whose genes have been modified in the laboratory.
The moratorium does not apply to research into GMOs, or genetically modified organisms, nor does it stop the import of genetically modified food.
But its supporters say the victory is a clear signal that Swiss consumers and farmers are in favor of GM-free food and produce, at a time when traditional Swiss farms are under threat from cuts in agricultural subsidies.
"All the farmers' organizations were behind this proposal, which they see as a chance for Swiss agriculture," said Daniel Ammann, a spokesman for the winning coalition of GMO crop opponents. "Swiss farming was already very ecologically sound and animal-friendly, and farmers are convinced now that with the added label of 'GMO-free,' they will be able to emphasize the quality of Swiss produce," he said.
However, the ban could isolate Switzerland within Europe and lead to a brain drain of researchers, its opponents said.
Official results showed that 55.7 percent of voters accepted the proposal to impose a five-year moratorium.
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