Insects offered GM-free refuges are eating modified crops further afield.
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References
Gould, F. et al. Bacillus thuringiensis resistance management: Stable isotope assessment of alternate host use by Helicoverpa zea. Proceedings of the National Academy of Sciences, published online, doi:10.1073/pnas.242382499 (2002).
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Clarke, T. Corn could make cotton pests Bt resistant. Nature (2002). https://doi.org/10.1038/news021202-3
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DOI: https://doi.org/10.1038/news021202-3