Week 35 – Aug 25-31

2013 MOSQUITO REPORT: WEEK 35

Report based on data collected from traps deployed the week of August 25-31, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
This week, host-seeking mosquitoes have returned to average numbers in our collections throughout most of Norfolk County. Only Millis and Quincy reported lower than average numbers whereas Bellingham, Dedham, Dover, Medfield, Medway, and Randolph collected higher than average numbers of mosquitoes.

Gravid Traps:
Gravid traps continue to show an average number of mosquitoes throughout Norfolk County for the week, though Avon, Bellingham, Dover, Medway, Needham, Norfolk, and Quincy collected more than the historical average for this time of the season.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most abundant mosquito species this week are, in order of abundance, Coquillettidia perturbans, Culex pipiens/restuans complex, Psorophora ferox, Aedes vexans, and Culiseta melanura. There was an isolated abundance ofOchlerotatus canadensis in Sharon.

Gravid Traps:
Culex pipiens/restuans are predominant in these traps and their overall population is average for this time of the season.

3. COMPARISON TO PREVIOUS SEASON

The overall mosquito population for host-seeking mosquitoes in CDC light traps is average. Gravid collections are average to above average. In terms of abundance, we are seeing mostly Psorophora ferox, Culex pipiens/restuans, Aedes vexans, Culiseta melanura, and Coquillettidia perturbans. The numbers of mosquitoes overall is not that great, but the risk of infectious disease at this time of the year is greater; therefore the abundance of these vectors is of concern.

4. WEATHER SUMMARY

Temperatures this week were slightly above normal (except Thursday when a backdoor front cooled the area). The only precipitation was from some light rain showers on Tuesday. Amounts ranged from around ¼ inch in the far southwest, to a few hundredths of an inch in the northeast. For the month of August, most of the district received between 2 and 3 inches of rain, which is 50-75% of normal.

Total weekly rainfall: 0.08 inches (-0.71 in.)
Total Monthly rainfall: 2.53 inches (-0.84 in.)
Total Yearly rainfall:    29.77 inches (+2.21 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We received 688 service requests this week, with a total of 10,899 service requests for the year.

6. MCP/COMMISSION RESPONSE

Catch basin treatments have ended. We are focusing on surveillance and ULV applications. We continue to conduct additional ULV applications in Weymouth, Canton, and Randolph this week as a precaution against EEE. We are conducting some barrier applications on municipal property where appropriate. Randolph, Sharon, and Needham schools are the focus of ULV and/or barrier applications the first week of September.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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