Location: Mosquito and Fly ResearchTitle: Field evaluation of indoor thermal fog and ultra-low volume applications for control of Aedes aegypti, in Thailand
|PONLAWAT, A - Armed Forces Research Institute Of Medical Sciences|
|HARWOOD, J - Department Of Defense|
|PUTNAM, J - Walter Reed Army Institute|
|NITATSUKPRASERT, C - Armed Forces Research Institute Of Medical Sciences|
|PONGSIRI, A - Armed Forces Research Institute Of Medical Sciences|
|KIJCHALAO, U - Armed Forces Research Institute Of Medical Sciences|
|Linthicum, Kenneth - Ken|
|Kline, Daniel - Dan|
|CLARK, GARY - Retired ARS Employee|
|OBENAUER, PETER - Department Of Defense|
|DOUD, C - Department Of Defense|
|MCCARDLE, P - Armed Forces Research Institute Of Medical Sciences|
|RICHARDSON, A - Department Of Defense|
|SZUMLAS, D - Walter Reed Army Institute|
|RICHARDSON, J - Walter Reed Army Institute|
Submitted to: Journal of the American Mosquito Control Association
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/1/2016
Publication Date: 6/5/2017
Citation: Ponlawat, A., Harwood, J.F., Putnam, J.L., Nitatsukprasert, C., Pongsiri, A., Kijchalao, U., Linthicum, K., Kline, D.L., Clark, G.G., Obenauer, P.J., Doud, C.W., McCardle, P.W., Richardson, A.G., Szumlas, D.E., Richardson, J.H. 2017. Field evaluation of indoor thermal fog and ultra-low volume applications for control of Aedes aegypti, in Thailand. Journal of the American Mosquito Control Association. 33(2):116-127.
Interpretive Summary: To improve the ability to control populations of Aedes aegypti mosquitoes inside houses two hand held sprayers and 3 insecticides were evaluated in villages in Central Thailand. One sprayer used thermal fogging technology and the other used Ultra-low Volume (ULV) technology. When an adulticide (containing pyrethrins and piperonylbutoxide as the active ingredients) were mixed with a larvicide (pyriproxyfen) adult mosquito populations were reduced for up to 20 days with both sprayers. Larval stage bioassays indicated that the ULV machine provided more control of immature mosquitoes developing in water.
Technical Abstract: Efficacies of a hand-held thermal fogger (PatriotTM) and hand-held Ultra-low volume (ULV) sprayer (TwisterTM) with combinations of two different adulticides and an insect growth regulator (pyriproxyfen) were field assessed and compared for their impact on reducing dengue vector populations in Thailand. The effectiveness of the space sprays was evaluated by sampling the natural Ae. aegypti population in houses and determining their physiological status, by monitoring mortality of sentinel caged mosquitoes and by assessing larval mortality in laboratory bioassays using water exposed to the spray. The total of 14,584 Ae. aegypti were collected from BGS sentinel traps in this study. Results showed the combination of ULD® BP-300 (3% pyrethrin) and pyriproxyfen sprayed either by the Patriot or Twister significantly reduced Ae. aegypti populations up to 20 days post spray relative to the control clusters. The addition of pyriproxyfen to the adulticide significantly influenced the duration to suppress mosquito populations. The thermal fogger resulted in higher mortality in caged mosquitoes than the ULV. However, neither machine was able to achieve high mortality Ae. aegypti placed in hidden cages. The larval bioassay results demonstrated that the ULV machine provided better adult emergence inhibition than the thermal fogger.