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Pesticide resistance is the ability of a pest population, such as insects, fungi, weeds or rodents, to evolve a tolerance to a pesticide that it was previously susceptible to. Retrieved from http://en.wikipedia.org/wiki/Pesticide_...
But herbicide resistance is a problem for farmers regardless of whether they plant GM crops. Some 64 weed species are resistant to the herbicide atrazine, for example, and no crops have been genetically modified to withstand it (see âThe rise of superweedsâ).