DDT has been used in malaria vector control because of its long residual efficacy when sprayed on walls and ceilings (6–12 months depending on dosage and nature of substrate).
Vector control is a method to limit or eradicate the mammals, birds, insects or other arthropods which transmit disease pathogens. The most frequent type of vector control is mosquito control using a variety of strategies.
DDT has been listed in the Stockholm Convention for persistent organic pollutants for international control. Recognizing that total elimination in many malaria-prone countries is currently unfeasible because there are few affordable or effective alternatives, the convention exempts public health use within World Health Organization (WHO) guidelines from the ban.
Today, about 3,000 to 4,000 tonnes of DDT are produced each year for vector control. DDT is applied to the inside walls of homes to kill or repel mosquitoes. This intervention, called indoor residual spraying (IRS), greatly reduces environmental damage. It also reduces the incidence of DDT resistance.
DDT (dichlorodiphenyltrichloroethane)
Reference
http://www.chem.unep.ch/DDT/documents/WHO_FAQonDDT.pdf
http://whqlibdoc.who.int/hq/2011/WHO_HTM_GMP_2011_eng.pdf
http://en.wikipedia.org/wiki/DDT
http://www.epa.gov/airquality/community/details/i-pesticides.html
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