Word: dieldrin
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Dates: during 1950-1959
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...Anopheles should be prevented from starting any new infections, and old ones will eventually burn out because the parasites lose their reproductive powers after two or three years. In areas where the mosquitoes are resistant to DDT, another insecticide, dieldrin, will be used. Where the mosquitoes bite in the open, preventive drugs will be used in addition to spraying. Example: the entire table-salt supply for the Amazon Valley is now being laced with chloroquine to build up the inhabitants' resistance...
Then the researchers dipped their screening strips in dieldrin, a powerful, non-evaporating fly poison, and tacked them up again. The flies took refuge on them in swarms-and died in five seconds. The poison remained effective for more than 16 weeks, slaying battalions of flies. The Cornell scientists believe that this anti-fly tactic is better than indiscriminate spraying of dairy barns and yards. The poison stays on the screening, never strays into the milk...