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Natural weed populations contain individual plants (biotypes) that are more tolerant to a herbicide. Repeated use of any herbicide by itself will expose weed populations to selection pressure which may result in the survival of individual plants with greater tolerance or resistance to the repeatedly used herbicide. If these plants are not controlled by another herbicide or cultural practice, the herbicide-resistant biotype can reproduce and spread.
Read more about proactive weed management at RoundupReadyPLUS.com.