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Study shows Bt trait in corn having reduced effectiveness

By Matt Shipman, NC State University

A new study from North Carolina State University and Clemson University finds that the toxin in a widely used genetically modified (GM) crop is having little impact on the crop pest called corn earworm (Helicoverpa zea) – which is consistent with predictions made almost 20 years ago that had been largely ignored. The study may be a signal to pay closer attention to warning signs about the development of resistance in agricultural pests to GM crops.

At issue is genetically engineered corn that produces a Bacillus thuringiensis (Bt) protein which, in turn produces a toxin called Cry1Ab. This GM corn was originally designed to address a pest called the European corn borer (Ostrinia nubilalis) and went on the market in 1996.

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