Funnily enough, he was talking about atrazine. The introduction of atrazine into surface water had some nasty effects on frogs:
Atrazine, one of the world’s most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females…
“Atrazine, one of the world’s most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females…” . . .
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Seems that frogs should make excellent pest control for insects. Wonder if law of unintended consequences applies here.