Date of Publication :8th September 2024

Abstract:In areas that do not have designated mosquito management or vector control programs, there is typically limited data on potential mosquito related risks. The purpose of this project was to gather information that could be used to define the extent of mosquito related problems and the potential risk they pose to local populations, including livestock. Mosquito population data were collected at three sites using EVS CO2 baited traps, which utilize dry ice to attract female mosquitoes. The traps were set out from dusk to dawn one night each week for the duration of the active mosquito period. The number and species of mosquitoes captured were recorded along with environmental conditions. The species collected were verified by the Southwest Mosquito Abatement Laboratory in St. George, Utah. The duration of the active mosquito season lasted from May to September with the peak period in June and July. Typical activity periods were observed from dusk to dawn. Species within the Culex, Culiseta, and Ochlerotatus genera were observed. Through external lab analysis, it was determined that all mosquito samples were negative for West Nile Virus, Western Equine Encephalitis, and St. Louis Encephalitis Virus. The levels of mosquitoes observed in the collection areas were at nuisance levels in at least some of the high elevation areas studied. However, few specimens of known disease vectors (e.g. Culex tarsalis) were observed. Under these conditions, it was determined that the mosquito populations present would pose minimal disease risk to the local human and livestock populations. We would recommend nuisance management/mitigation techniques be used, including wearing protective clothing and using effective mosquito repellent, rather than employing larvicide or adulticide treatment in the area.

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