Week 25 – June 17-23

2012 MOSQUITO REPORT: WEEK 25

Report based on data collected from traps deployed the week of June 17, 2012 through June 23, 2012. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
This week’s trap collections showed that host-seeking mosquito populations are higher than average throughout all of Norfolk County.  Only Holbrook reported a less than average collection which may be due to equipment related issues that are being reviewed at the moment.

Gravid Traps:
Gravid trap collections are higher than average in most parts of Norfolk County this week.  The towns of Avon, Franklin, Medway, and Walpole collected lower than average numbers of gravid mosquitoes.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week were Culiseta melanura and Coquillettidia perturbans. Aedes vexans populations are higher than average in Dedham, Foxborough, Franklin, Medfield, Millis, and Randolph. Ochlerotatus canadensis and Culex pipiens/restuans populations are higher than average in the towns reporting higher than average numbers of mosquitoes.  Psorophora ferox populations are showing higher than average number in Canton.

Gravid Traps:
Culex pipiens/restuans are the most predominant species in gravid traps throughout Norfolk County, although Medfield collected more Ochlerotatus japonicus.

3. COMPARISON TO PREVIOUS SEASON

The warm weather and plentiful rain from a few weeks ago have contributed to a higher than average population of mosquitoes in our county.  Rain has been predicted for next week’s forecast and coupled with continuing warm weather and ample sunshine, there shall be more mosquitoes when compared with the weekly historical records.

4. WEATHER SUMMARY

This week started with sunny but cool weather. A dramatic change on Wednesday brought continued sunny but hot and humid conditions. A cold front approached the area by the end of the week. On Friday, thunderstorms affected the western parts of the district with locally over ¾ of an inch of rain. The remnants of these storms gave lighter rains (less than ¼ inch) over eastern sections. On Saturday, thunderstorms redeveloped, this time over far eastern sections where locally over ½ inch of rain fell. The remainder of the district received no precipitation on Saturday.

Total weekly rainfall: 0.16 inches (-0.60 in.)
Total Monthly rainfall: 2.56 inches (+0.08 in.)
Total Yearly rainfall: 13.54 inches (-7.00 in.)

5. NUMBER OF REQUESTS FOR SERVICE

 NCMCD has received 2,434 calls year to date for services as of 6/22/12. The NCMCD received 500 calls for service this week.

6. MCP/COMMISSION RESPONSE

NCMCD continues ULV applications in response to requests, and basin treatments in ‘urban’ areas of the district.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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