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Syngenta queries US frog study

Syngenta has questioned the validity of a US study indicating that the herbicide, atrazine, disrupts the sexuality of male frogs. Research by Professor Tyrone Hayes at the University of California at Berkeley shows that 75% of frogs exposed to 2.5 ppb of atrazine in the laboratory for three years were “chemically castrated”, while 10% turned from male to female. The latter could mate successfully but produced only male frogs. “The genetically male females can decrease or wipe out a population just because they skew sex ratios so badly,” Professor Hayes says. He has been pointing to links between atrazine and the sexual development of amphibians for nearly a decade.

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