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Health Department » Communicable Disease » West Nile Virus/EEE MOSQUITO CONTROL PROGRAM Mosquito Control commences each spring in the Town of Salem, NH. Crews begin checking vernal pools, swamps, catch basins, ditches, depressions and other areas of shallow, stagnant water for mosquito larvae and pupae. When mosquitoes are found, the following insecticides may be used: VectoBac Bti (Bacillus thuringiensis israelensis), Altosid (methoprene) or Agnique MMF (poly-isooctadecyl-hydroxyl). This type of treatment is call larvaciding and it is a safe and effective method to prevent immature mosquitoes from developing into flying, biting adults. In some locations, predators feed on mosquito larvae which eliminates the need for spraying. The spray schedule is based upon mosquito surveillance data and weather conditions. Residents who do not want their property treated must contact Dragon Mosquito Control in writing at P.O. Box 46, Stratham, NH 03885. Otherwise, mosquitoes may be sprayed on your property, if necessary. Another component of the Mosquito Control Program includes trapping of adult mosquitoes. Typically, two traps are located within the town to collect adult mosquitoes in order to determine the extent of mosquito activity and the types of mosquitoes present. Over 20 species of mosquitoes have been identified in Salem and this information is important to conclude if we have the species that typically carry West Nile Virus or Eastern Equine Encephalitis. After identification, the mosquitoes are sent to the NH State Laboratory to determine if they are carrying either one of these viruses. In preparation for the 4th of July Celebration, control of adult mosquitoes will be done using permethrin and sumithrin. Areas to be sprayed are the High School and Junior High School fields and the "Field of Dreams". Residents may call Dragon Mosquito Control at 964-8400 or the Salem Health Department at 890-2050 for more information on spray dates, location, materials used, precautions or other concerns including Eastern Equine Encephalitis and West Nile Virus. If West Nile Virus or Eastern Equine Encephalitis becomes a public health threat in Salem, adulticiding (adult spraying) may be considered. Areas to be sprayed with permethrin and sumithrin will be determined based on locations of birds and mosquitoes found positive with one of these viruses. In addition, adulticiding may be recommended for athletic fields and school playgrounds. Public notice of this spraying will be disseminated to the residents including information on how to limit your exposure to these insecticides. Important note: The State Lab is no longer accepting dead birds from Salem for West Nile Virus or EEE testing. We have already identified positive birds (as well as a mosquito) and now the state feels it is unnecessary to continue testing. If you receive any calls from residents, you can direct them to me or simply inform them that the bird can be discarded in the trash or by burial. I always caution them not to handle the bird with bare hands and to use gloves or a shovel. Documents: West Nile Virus Information West Nile Virus Public Service Announcement Public Advisory for West Nile Virus & EEE Links: NH State Health & Human Services 
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