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US EPA warns of <i>Bt</i> resistance in Monsanto maize

A US EPA investigation has concluded that corn rootworm ( Diabrotica spp) resistance to the Bt Cry3Bb1 toxin in Monsanto’s genetically modified insect-resistant maize lines is suspected in parts of four states. The review by the Biopesticides and Pollution Prevention Division’s Insect Resistance Management (IRM) team followed “unexpected damage” reports in Iowa, Illinois, Minnesota and Nebraska.



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