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E-M:/ West Nile and EEE spraying can increess numbers of Moquitoes mosttalented at transmitting the disease.



Title:
Impact of naled (Dibrom 14) on the mosquito vectors of eastern equine encephalitis virus.

SOURCE: Journal of the Am Mosquito Control Assoc, Dec;13(4):315-25, 1997 - Howard JJ, Oliver - New York State Department of Health, SUNY-College ESF, Syracuse 13210, USA.

In central New York, aerial mosquito adulticide applications have been used in response to eastern equine encephalitis (EEE) outbreaks and have targeted the swamp habitats of the primary enzootic vector of EEE virus, Culiseta melanura (Coquillett). The organophosphate insecticide naled (1, 2, dibromo-2, 2-dichloroethyl dimethyl phosphate) has been the insecticide of choice in this region. This study reports on analyses of 11 years (1984-94) of mosquito collection data from Cicero and Toad Harbor swamps in relation to applications of naled.

Naled applications were successful in achieving short-term reductions in mosquito abundance. However, despite repetitive applications, populations of the primary vector of EEE virus, Cs. melanura, have increased 15-fold at Cicero Swamp. Preventive applications had no noticeable impact on the enzootic amplification of EEE virus, and isolations of virus following preventive applications have resulted in additional spraying. The possibility that applications of naled contributed to increased populations of Cs. melanura discredits the rationale that preventive applications of naled reduce the risk of EEE.
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Samuel DeFazio
Praxis
2793 116th Ave
Allegan, MI  49010  616-673-2793