Resistance is useless


In the first officially confirmed case of its kind, weeds in Canada have become resistant to three kinds of herbicide. The plants picked up genes from three different, genetically modified varieties of the rapeseed crop canola. In 1997, a farmer in Alberta planted separate fields, each 30 metres apart, with canola that resisted either Monsanto’s Roundup herbicide, Cyanamid’s Pursuit or Aventis’s Liberty. In 1998, he found weeds that resisted two herbicides, and last year, weeds that resisted all three. Only more toxic herbicides, such as 2,4-D,
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