Week 39 – Sept 27-Oct 1

2010 Mosquito Report: Week 39

Report based on data collected from traps deployed the week of September 27, 2010 through October 1, 2010. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. mosquito activity for the season

The 2010 mosquito control season started ominously with torrential rain and flooding followed by warm temperatures and plenty of sunlight, providing ample habitat for the usual spring broods. Mosquitoes were emerging 2 weeks earlier than average. The NCMCP conducted an aerial larvicide to control the inevitable mass emergence that was expected. Fortunately, the flooding occurred early enough in the season that it did not sustain an explosion of summer species such as Aedes vexans, known to emerge simultaneously in the millions around the flood plains of the Charles and Neponset Rivers and to travel for miles in the surrounding areas in search of a blood meal. The lack of rain throughout the rest of the season was fortuitous, since Coquillettidia perturbans (a EEE vector) populations, benefitting from the early rainstorms, had literally exploded and reached higher numbers than historical records. The lack of heavy rains in the summer prevented the annual mass emergence of Ae. vexans, but the regular rain events were enough to keep containers and permanent ponds filled as habitat for Culex pipiens/restuans mosquitoes, the main vectors of West Nile virus. From late June until the last week of surveillance, gravid traps around the county collected high numbers of Cx. pipiens/restuans, which would serve as an omen for the high occurrence of West Nile virus and Eastern Equine Encephalitis that would be found in and around Norfolk County.

2. Weather Summary

Not available this week.

3. Number of requests for service

NCMCP received 7,216 calls year to date for service. NCMCP had discontinued recording calls from residents requesting ULV applications.

4. MCP/Commission response

NCMCP suspended all ground ULV applications effective Friday, September 10, 2010. All field operations are focused on water management activities. The Director notes that although virus activity persists, the Project has transitioned from considering a control strategy to public outreach. As weather conditions continue to deteriorate adult control operations become ineffective so it is important to continue promoting personnel protection whether thatbe the use of an appropriate repellant, avoiding activities from dust to dawn or wearing long sleeved shirts and pants when outdoors in mosquito active areas. These personnel protection efforts should continue until the first hard frost of the fall.


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