Exploring New Thermal Fog and Ultra-Low Volume Technologies to Improve Indoor Control of the Dengue Vector, Aedes aegypti (Diptera: Culicidae)

• Published in: Journal of medical entomology 2014-07, Vol.51 (4), p.845-854
• Main Authors: Harwood, James F., Farooq, Muhammad, Richardson, Alec G., Doud, Carl W., Putnam, John L., Szumlas, Daniel E., Richardson, Jason H.
• Format: Article
• Language: English
• Subjects: active ingredients; adults; Aedes; Aedes aegypti; Animal behavior; Animals; containers; dengue; Dengue - transmission; droplet size; Health aspects; humans; indoor space spray; insect growth regulators; Insect Vectors; Insecticides; Insecticides - administration & dosage; Juvenile Hormones - administration & dosage; Larva; larvae; Mortality; mosquito control; Mosquito Control - methods; Mosquitoes; population; pyriproxyfen; risk; risk reduction; thermal fog; ultra-low volume; vector control; VECTOR CONTROL, PEST MANAGEMENT, RESISTANCE, REPELLENTS
• ISSN: 0022-2585; 1938-2928
• DOI: 10.1603/ME14056

Control of the mosquito vector, Aedes aegypti (L.), inside human habitations must be performed quickly and efficiently to reduce the risk of transmission during dengue outbreaks. As part of a broad study to assess the efficacy of dengue vector control tools for the U.S. Military, two pesticide delivery systems (ultra-low volume [ULV] and thermal fog) were evaluated for their ability to provide immediate control of Ae. aegypti mosquitoes with a contact insecticide inside simulated urban structures. An insect growth regulator was also applied to determine how well each sprayer delivered lethal doses of active ingredient to indoor water containers for pupal control. Mortality of caged Ae. aegypti, pesticide droplet size, and droplet deposition were recorded after applications. In addition, larval and pupal mortality was measured from treated water samples for 4 wk after the applications. The ULV and the thermal fogger performed equally well in delivering lethal doses of adulticide throughout the structures. The ULV resulted in greater larval mortality and adult emergence inhibition in the water containers for a longer period than the thermal fogger. Therefore, the ULV technology is expected to be a better tool for sustained vector suppression when combined with an effective insect growth regulator. However, during a dengue outbreak, either delivery system should provide an immediate knockdown of vector populations that may lower the risk of infection and allow other suppression strategies to be implemented.