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Am. J. Trop. Med. Hyg., 24(2), 1975, pp. 188-192
Copyright © 1975 by The American Society of Tropical Medicine and Hygiene

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A Prospective Study of the Effects of Ultralow Volume (ULV) Aerial Application of Malathion on Epidemic Plasmodium falciparum Malaria

II. Entomologic and Operational Aspects*

R. T. Taylor, Marc Solis, David B. Weathers AND John W. Taylor
Bureau of Tropical Diseases, Center for Disease Control, Public Health Service, U. S. Department of Health, Education and Welfare, Atlanta, Georgia 30333, and Service National d'Eradication de la Malaria, Port-au-Prince, Haiti

In a large-scale study in the Miragoane Valley of Haiti, designed to test the effects of aerial ultralow volume (ULV) malathion on epidemic Plasmodium falciparum malaria, spray operations resulted in an immediate and sharp decline in numbers of the vector, Anopheles albimanus. The adult population of this mosquito remained at <1% of previous levels until several weeks after a 50-day spray period (27 October-16 December 1972) during which six cycles were completed. The study area offered ideal conditions of wind, temperature, humidity, and mountain barriers. Mosquitoes in the area were highly susceptible to malathion. Results indicated that aerial ULV treatment with malathion can reduce A. albimanus populations rapidly and effectively when applications are made over an area as large as 20,000 acres. Preliminary results showed that effective control was not achieved in areas one-quarter that size; these areas were not sufficiently large, infiltration of mosquitoes from adjacent untreated areas was possible.

Accepted for publication July 13, 1974.


* This work was supported by the United States Agency for International Development, U.S. Department of State, through PASA LA (HM 7-71).

Address reprint requests to: Center for Disease Control, Attn: Bureau of Tropical Diseases, Atlanta, Georgia 30333.






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Copyright © 1975 by the American Society of Tropical Medicine and Hygiene.