Week 36 – Sept 2 – 3

2009 Mosquito Report: Week 36

Report based on data collected from traps deployed on Wednesday, September 2, 2009 and retrieved on Thursday, September 3, 2009. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. Current mosquito activity/trend

CDC Light Traps:
Host-seeking mosquito activity was mixed once again throughout Norfolk County. The towns of Foxboro, Franklin, Holbrook, Medfield, Medway, Quincy, Sharon, and Walpole recorded higher than average numbers of host-seeking mosquitoes; whereas Canton, Plainville, and Weymouth experienced lower than average mosquito activity. The remaining towns in Norfolk County experienced average host-seeking mosquito activity.

Gravid Traps:
Most gravid traps have once again dropped below average levels of activity across Norfolk County. Only Medway reported higher than average gravid mosquito activity. The following towns experienced average mosquito activity: Bellingham, Dover, Foxboro, Medfield, Norfolk, Westwood, andWeymouth.

2. Current Predominant Species

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week were Culex pipiens/restuans, as noted in the towns of Franklin, Medway, and Quincy. Culiseta melanura populations are higher than average in Holbrook, Medway, and Walpole. Ochlerotatus canadensis populations are higher than average in Foxboro and Sharon, but have dropped in Plainville Following the heavy rain associated with Hurricane Danny, NCMCP personnel conducted extensive field surveys of both the Charles and Neponset Riverflood plains. No significant flooding was observed which resulted in the suspension of aerial larval control preparations.

Gravid Traps:
Although gravid traps remain predominated by Culex pipiens/restuans, their abundance was lower than average across Norfolk County. Parts of Dedhamare reporting higher than average Anopheles punctipennis populations.

3. Comparison to previous season

Compared to the previous seasons, host-seeking mosquito activity this week was mixed. Culex pipiens/restuans populations have dipped throughout the county, but remain higher than average in Franklin, Medway, and Quincy. The cooler evenings are having a dramatic reducing effect on mosquito trap populations. Gravid trap activity has dropped once again in most parts of Norfolk County. Anopheles punctipennis populations are high in parts Dedham.

4. Weather Summary

No rain fell across the county this week. Temperatures also ran slightly below normal with low humidity levels.

Total weekly rainfall: 0.00 inches (-0.80 in.)
Total Monthly rainfall: 0.00 inches (-0.57 in.)
Total Yearly rainfall: 30.21 inches (+1.94 in.)

5. Number of requests for service

NCMCP received 5,664 calls for service as of 9/04/09. NCMCP received 292 calls for service this week.

6. MCP/Commission response

NCMCP ground ULV applications have declined this week. The main areas of concern are in North Weymouth and Quincy (neighborhoods adjacent to Broad Meadows). High Oc. sollicitans populations in both areas are as a result of man made disturbances. Coordination between NCMCP and all local Boards of Health is ongoing relative to interpretation of surveillance data and how best to get the word out to the public relative to avoidance of mosquito bites. NCMCP remains prepared to conduct additional ground adulticide, ground larvicide and aerial larvicide control activities as required. NCMCP may consider discontinuing ULV applications as of Friday, September 11th due to consistent morning temperatures below 60 degrees. NCMCP will remain prepared to ULV areas if high level virus activity is identified anywhere in the county.


144 Production Rd, Suite C

Walpole, MA 02081

Office: (781) 762-3681
Fax: (781) 769-6436