Genetically-modified superweeds "not uncommon"

The so-called 'superweeds' result from accidental crosses between neighbouring crops that have been genetically modified to resist different herbicides. Farmers are often forced to resort to older stronger herbicides to remove them.
Brian Johnson, at English Nature is alarmed by the speed of the process: "This has happened in three or four years," he says. The report predicts that, in the UK, plants with multiple herbicide resistance will be "almost impossible to prevent unless the crops are very widely dispersed."


[from New Scientist.com ]