Week 27 – July 5 – 9

2010 Mosquito Report: Week 27

Report based on data collected from traps deployed the week of July 5, 2010 through July 9, 2010. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. Current mosquito activity/trend

CDC Light Traps:
Mosquito activity in CDC light traps were mixed this week throughout Norfolk County. Foxboro, Plainville, Quincy, and Wrentham collected average numbers of mosquitoes. Towns that reported higher than average collections include: Avon, Bellingham, Braintree, Medway, Millis, Milton, parts of Sharon, parts of Walpole, parts of Weymouth, and Wrentham. Towns that collected fewer than the average include: Canton, Dedham, Franklin, Holbrook, Medfield, Needham, Norfolk, parts of Sharon, and parts of Walpole.

Gravid Traps:
Gravid trap collections also recorded mixed mosquito activity throughout Norfolk County. Braintree, parts of Foxboro, Needham, Norfolk, Sharon, and parts ofWalpole collected average numbers of mosquitoes. The following towns collected higher than average numbers of mosquitoes: Bellingham, parts of Dedham,Franklin, Medfield, Medway, Norwood, and parts of Quincy. Towns with lower than the historical average of mosquitoes include: Avon, Canton, parts of Dedham, Dover, parts of Foxboro, Holbrook, Millis, Milton, Plainville, parts of Quincy, Randolph, Stoughton, parts of Walpole, Westwood, Weymouth, and Wrentham.

2. Current Predominant Species

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week is split between Culex pipiens/restuans and Coquillettidia perturbans populations once more. Cx. pipiens/restuans remain plentiful in Medway traps whereas Co. perturbans has dominated the other town traps that have reported higher than average activity.

Gravid Traps:
Culex pipiens/restuans continue to dominate gravid traps, although figures are mixed throughout the county.

3. Comparison to previous season

Mosquito activity is varied this week in Norfolk County. Co. perturbans population booms are still isolated in towns such as Avon, Bellingham, Braintree, Millis,Milton, parts of Sharon, Walpole, parts of Weymouth, and parts of Wrentham. Aedes vexans populations have been lower than average thus far and so havePsorophora ferox and Oc. canadensis populations for the historical week.

4. Weather Summary

This week was very hot and humid with no rainfall until Saturday when a weak front moved into the area. With a tropical air mass in place, thunderstorms produced very heavy rain on Saturday; however, most of Norfolk County was missed by the worst of the rain. The heaviest rain (greater than ½ inch) fell in an arc along the extreme western, northern, and eastern sections with Quincy receiving the heaviest amounts (greater than 1 inch). Otherwise the rest of the county had amounts of ¼ inch or less. This leaves our area with well below normal precipitation over the longer term (30, 60, and 90 days).

Total weekly rainfall: 0.16 inches (-0.53 in.)
Total Monthly rainfall: 0.16 inches (-0.84 in.)
Total Yearly rainfall: 29.65 inches (+7.54 in.)

5. Number of requests for service

NCMCP received 3,648 calls year to date for service as of 7/9/10. NCMCP received 262 calls for service this week.

6. MCP/Commission response

NCMCP continues to conduct “scattered and isolated” ground ULV applications when and where necessary. Calls for service this year are the highest they have been at this point in the past three years. Although complaint calls are down this week versus last week almost by half, the remaining calls seem to be in response to locally emerging/active populations of Co. perturbans (as well as other permanent water species) and Oc. sollicitans since the collection of inland reflood species has dropped off in trap collections. NCMCP continues to treat rain basins using a pouch with Bs as the active ingredients. NCMCP has also been able to complete several water management projects during this “low flow” period.


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Walpole, MA 02081

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