Week 28 – July 8-14

2012 MOSQUITO REPORT: WEEK 28

Report based on data collected from traps deployed the week of July 8, 2012 through July 14, 2012. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Host seeking mosquito populations are generally mixed from lower to higher than average across Norfolk County. The towns of Bellingham, Braintree, Canton, Dedham, Foxborough, Plainville, Quincy, Stoughton, and Walpole reported higher than average collections, whereas most of the county had between lower than average and average trap collections.

Gravid Traps:
Gravid trap collections continue to indicate lower than average ovipositing mosquito populations in most parts of Norfolk County this week. The towns of Bellingham, Canton, Dover, Norfolk, and Weymouth collected higher than average numbers of ovipositing mosquitoes.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week were Coquillettidia perturbans once again, with populations higher than average in Braintree, Canton, Dedham, Foxborough, Plainville, Stoughton, and Walpole. Aedes vexans populations are higher than average in Dedham and Randolph.  Ochlerotatus canadensis populations have waned although there is a higher than average population in Bellingham.

Gravid Traps:
Culex pipiens/restuans are the most predominant species in gravid traps throughout Norfolk County.

3. COMPARISON TO PREVIOUS SEASON

The mixed collections for host-seeking mosquitoes cannot be simply explained. Most likely this just represents the waning of the first generation with an expected emergence in the coming weeks as most of these species have been speculated to be bivoltine in nature. Gravid mosquito populations are lower than normal and is likely a reflection of the host-seeking population; where there are fewer host-seeking mosquitoes, there will be fewer ovipositing mosquitoes.

4. WEATHER SUMMARY

Temperatures this week were generally above normal, while there was no precipitation in the district this week as our dry stretch continued. Dryness has intensified during the past couple of weeks due to lack of rain and high evaporation with the above normal temperatures. So far this month, precipitation has been 10-25% of normal across the district, with 30 and 60 day deficits running 25-75% of normal (driest west).

Total weekly rainfall: 0.00 inches (-0.68 in.)
Total Monthly rainfall: 0.35 inches (-1.04 in.)
Total Yearly rainfall: 15.31 inches (-7.35 in.)

5. NUMBER OF REQUESTS FOR SERVICE

NCMCD has received 3,989 calls year to date for services as of 7/13/12. The NCMCD received 577 calls for service this week.

6. MCP/COMMISSION RESPONSE

The NCMCD continues to respond to ULV requests by residents. With some overtime work by the field crew and a slight drop off in the rate of requests, we have been able to ‘catch up’ with treatments in almost all the towns. Basin treatments continue in all municipalities. Very few larvicide requests are being initiated at this time. Some of the locations are treated for mosquito larvae but most are either dry or have no larvae.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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