According to a summary by the International Service for the Acquisition of Agri-tech Applications (ISAAA: www. isaaa.org), the authors of the first report "Field-Evolved Insect Resistance to Transgenic Bt Crops" - found "that most insect pests targeted by Bt crops in Australia, China, Spain and the U.S. did not evolve resistance during the first decade the crops were grown, except for Helicoverpa zea."
inform September 2008, Vol. 19 (9) Genotyping the DNA of old, non
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