Impact of aerial spraying of pyrethrin insecticide on Culex pipiens and Culex tarsalis (Diptera: Culicidae) abundance and West Nile virus infection rates in an urban/suburban area of Sacramento County, California.

Journal of Medical Entomology
Dia-Eldin A ElnaiemDavid Brown

Abstract

In response to an epidemic amplification of West Nile virus (family Flaviviridae, genus Flavivirus, WNV), the Sacramento and Yolo Mosquito and Vector Control District (SYMVCD) sprayed ultralow-volume (ULV) formulations of pyrethrin insecticide (Evergreen EC 60-6: 6% pyrethrin insecticide, 60% piperonylbutoxide; MGK, Minneapolis, MN, applied as 0.003 kg/ha [0.0025 lb/acre] ) over 218 km2 in north Sacramento and 243.5 km2 in south Sacramento on three consecutive evenings in August 2005. We evaluated the impact of this intervention in north Sacramento on the abundance and WNV infection rates of Culex pipiens L. and Culex tarsalis Coquillett. Mortality rates of caged Cx. tarsalis sentinels ranged from 0% under dense canopy to 100% in open fields. A comparison of weekly geometric mean mosquito abundance in CO2-baited traps in sprayed and unsprayed areas before and after treatment indicated a 75.0 and 48.7% reduction in the abundance of Cx. pipiens and Cx. tarsalis, respectively. This reduction was statistically significant for Cx. pipiens, the primary vector of WNV, with highest abundance in this urban area, but not for Cx. tarsalis, which is more associated with rural areas. The infection rates of WNV in Cx. pipiens and Cx. tarsali...Continue Reading

References

Jan 1, 1958·Biological Sciences·J C MACDONALD

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Citations

Jul 15, 2009·International Journal of Health Geographics·Ramanathan SugumaranJohn P Degroote
Mar 6, 2010·Emerging Infectious Diseases·Loren M BarberRobert K D Peterson
Aug 2, 2011·Emerging Infectious Diseases·Ryan M CarneyVicki Kramer
Sep 7, 2013·Viruses·William K Reisen
Dec 10, 2013·International Journal of Environmental Research and Public Health·Andriani MarkaGeorgios Eleftheriou
Aug 8, 2013·Vector Borne and Zoonotic Diseases·Alexandra ChaskopoulouMaria Papanastassopoulou
Dec 12, 2012·International Journal of Environmental Research and Public Health·Jorge R ReyAimlee D Laderman
Nov 17, 2016·Parasite : Journal De La Société Française De Parasitologie·Michaël Luciano TantelySébastien Boyer
Feb 14, 2013·Journal of the American Mosquito Control Association·Theodore G Andreadis
Jan 14, 2012·Journal of Medical Entomology·Jeffrey Shaman
Aug 6, 2009·Journal of the American Mosquito Control Association·Jonathan A KwanMichael K Niemela

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