Ecology: Pesticide into Pest

Few chemicals concocted by man have been so widely used and so thoroughly applauded as dichlorodiphenyltrichloroethane, more commonly known as DDT. It has proved its unmatched power in the worldwide battle against those pestborne killers, typhus, encephalitis and, particularly, malaria. Its mastery over the mosquitoes that carry malaria has undoubtedly spared millions of people from death and debilitating infection. Equally potent in saving crops, it has almost doubled the yield from U.S. cotton fields in the past two decades by controlling the boll weevil. Even the Swedes, who have decided to...

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