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US study highlights warning of earworm resistance

US scientists say that warnings about the risks of corn earworms (Helicoverpa zea) developing resistance to the Bt Cry1Ab toxin in genetically modified insect-resistant maize were ignored and that resistance may now have developed. A study by researchers at North Carolina State University and Clemson University shows that the toxin has little impact on the pest, which is consistent with predictions made almost 20 years ago.

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