Volume 24, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In a large-scale study in the Miragoane Valley of Haiti, designed to test the effects of aerial ultralow volume (ULV) malathion on epidemic malaria, spray operations resulted in an immediate and sharp decline in numbers of the vector, . 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 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.


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