Week 34 – Aug 18-24

2013 MOSQUITO REPORT: WEEK 34

Report based on data collected from traps deployed the week of August 18-24, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Host-seeking mosquitoes are mostly average to above average in our collections throughout most of Norfolk County. Avon, Holbrook, Milton, Needham, and Quincy reported lower than average numbers whereas Bellingham, Dedham, Dover, Medfield, Medway, Millis, Norwood, Randolph, Sharon, Weymouth, and Wrentham 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. Only Avon, Franklin, Medway, and Needham 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 to above avergae compared to the historical averages for each town. Gravid collections are average. We are seeing new emergences ofCoquillettidia perturbans, Psorophora ferox, and Culiseta melanura throughout the county. This is the effect of the last heavy rain event about a couple of weeks ago. A localized new emergence of Ochlerotatus canadensis has been observed in Sharon, likely due to the same rain event.

4. WEATHER SUMMARY

Temperatures this week averaged above normal for much of the week until a cold front brought cooler weather by the end. This cold front came through mainly dry except for a brief thunderstorm that affected the extreme southern portions of the district in Avon and Holbrook, but only up to ¼ inch of rain fell there. Otherwise, no rain fell during the week across the remainder of the district.

Total weekly rainfall: 0.00 inches (-0.78 in.)
Total Monthly rainfall: 2.45 inches (-0.13 in.)
Total Yearly rainfall:   29.69 inches (+2.77 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We received 241 service requests this week, with a total of 10,248 service requests for the year.

6. MCP/COMMISSION RESPONSE

The NCMCD had been seeing a general decline in requests for ULV applications over the last few weeks due to a most notable lack of rain recently and wetlands drying down. In response to the recent human fatality due to EEE we did see a sharp increase in calls especially in Weymouth and the eastern towns.

We continue to respond to requests with ULV applications and have completed extensive ULV application coverage in Weymouth and adjacent areas of Braintree and Holbrook. We will continue with ULV applications to the Weymouth area this week according to label restrictions, as well as normal response to requests in the other towns. With a EEE isolation in human biting mosquitoes in Canton, we will also conduct extensive spraying in Canton surrounding the area of that isolation.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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