GM crops created superweed, say scientists

This news is very serious for two reasons. First, scientists promoting genetically modified crops were sure it couldn't happen. "Jurassic Park" had it right -- "life will find a way." What else might happen despite assurances? Secondly, these superweeds will cause tremendous damage if they multiply -- for conventional and organic growers. This story details instances in Canada and elswhere where superweeds are a real problem. In some of these instances, it's not even genetic modification causing the problem -- it's just the selection pressure from repeatedly using powerful chemical pesticides.
Guardian Unlimited | GM crops created superweed, say scientists:
Paul Brown, environment correspondent -- The Guardian -- July 25, 2005

Modified rape crosses with wild plant to create tough pesticide-resistant strain
Modified genes from crops in a GM crop trial have transferred into local wild plants, creating a form of herbicide-resistant 'superweed', the Guardian can reveal.
The cross-fertilisation between GM oilseed rape, a brassica, and a distantly related plant, charlock, had been discounted as virtually impossible by scientists with the environment department. It was found during a follow up to the government's three-year trials of GM crops which ended two years ago.
The new form of charlock was growing among many others in a field which had been used to grow GM rape. When scientists treated it with lethal herbicide it showed no ill-effects.