Week 31 – July 28-Aug 3

2013 MOSQUITO REPORT: WEEK 31

Report based on data collected from traps deployed the week of July 28-August 3, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
CDC light traps collections continue to be mostly average to lower than average this week for host-seeking mosquitoes. Only Quincy and Walpole collected a higher than average number of mosquitoes.

Gravid Traps:
Gravid mosquito collections are now mostly average through all of Norfolk County. Avon, Franklin, Millis, Milton, and Needham collected higher than average numbers of ovipositing Culex pipiens/restuans mosquitoes.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
IThe most abundant mosquito species this week is Coquillettidia perturbans (Dedham and Walpole) and Psorophora ferox (Canton). This week we experienced a higher than average occurrance of Aedes taeniorhynchus and Ae. sollicitansin Quincy which coincides with a high tide from the previous week.  Culiseta melanura still is not a prominent species in our trap sites.

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

3. COMPARISON TO PREVIOUS SEASON

The overall mosquito population for this week is about average compared to the historical averages for each town. The towns of Quincy and Weymounth are experiencing a minor outbreak of salt marsh mosquitoes due to a high tide a week or so ago. Compared to the incredible numbers we were collecting a month ago, the population of mosquitoes has gone down substantially.

4. WEATHER SUMMARY

Temperatures this week averaged close to normal with comfortable humidity. Two episodes of rainfall occurred. Thunderstorms on Monday were focused mainly along the southern border of the district, while more widespread showers brought light precipitation on Friday morning. Weekly rainfall ranged from under ¼ inch in the northeast sections, to over ½ inch along the southern and extreme northern border, with locally over an inch in Franklin.

Total weekly rainfall:  0.40 inches (-0.31 in.)
Total Monthly rainfall:  2.49 inches (-0.57 in.)
Total Yearly rainfall:  27.44 inches (+2.80 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We received 889 service requests this week, with a total of 8,216 service requests for the year.

6. MCP/COMMISSION RESPONSE

A July 23rd spring high tide over 12 feet high was the source of water for an emergence of Aedes sollicitans like we have not seen for quite a while. Across Weymouth and Quincy shoreline communities, the calls have been desperate as people are unable to venture outside due to the large numbers of mosquitoes. NCMCD is conducting off-schedule ULV applications in Weymouth and Quincy this week to help alleviate this problem. Otherwise calls across the district are declining but still high. ULV applications are being conducted in response. Catch basin treatments continue especially in the more densely populated towns in the eastern part of the district as WNV begins to show up in mosquito pools. Many residents are still requesting ground larviciding as well, but most sites are now drying up.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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