ABSTRACT - EPA scientists conclude that atrazine, country's most widely used pesticide, causes sexual abnormalities in frogs, such as multiple testes and multiple ovaries; recommend further research into atrazine's mechanisms and its broader impact on frog populations; scientists hired by Syngenta, major manufacturer of atrazine, dispute finding; atrazine is popular with farmers because it is effective and relatively cheap; has been banned in seven European countries (M) Scientists from the Environmental Protection Agency say there is ''sufficient evidence'' to conclude that the country's most widely used pesticide, atrazine, causes sexual abnormality in frogs.

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