"As dramatically effective and universally applicable chemical methods may be, they cannot provide the long-lasting sustainability of environmental management methods. None of the chemical methods of malaria control last longer than a handful of years. Insecticide-treated bednets must be replaced or re-treated every three to four years. Drugs must be continually administered. Interior walls must be re-sprayed with insecticide every six to 12 months... The benefits of environmental management techniques -- their longer-term sustainability, ability to harness community participation, and lower overall costs -- may tip the balance in their favor in other fronts in the war on malaria" ...
http://www.treehugger.com/files/2010/05/weedwhacker-more-efficient-than-ddt-when-it-comes-to-mosquitoes.php
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