Pests are becoming resistant to genetically-modified crops, according to a new study of Bt corn and cotton
The study, published in the journal Nature Biotechnology, looks at so-called Bt corn and cotton -- plants modified to exude Bacillus thuringiensis, a bacterium toxic to insects. U.S. and French researchers analyzed a total of 77 studies of 13 major pests covering eight countries on five continents. Five species were considered resistant by 2011, compared with only one in 2005, the study found.
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