Week 27 – July 1-7

2012 MOSQUITO REPORT: WEEK 27

Report based on data collected from traps deployed the week of July 1, 2012 through July 7, 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 continue to vary with the weather this week. The towns of Avon, Bellingham, Canton, Franklin, Holbrook, Medway, and Milton reported lower than average collections, whereas most of the county had between average and higher than average trap collections.

Gravid Traps:
Gravid trap collections are lower than average in most parts of Norfolk County this week. The towns of Bellingham, Braintree, Canton, Dedham, Dover, Foxborough, Sharon, Stoughton, 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; this species has reached higher than average levels in Braintree, Dedham, Foxborough, Plainville, Quincy, Stoughton, Walpole, and Weymouth. Aedes vexans populations are unexpectedly higher than average only in Dedham. Ochlerotatus canadensisis also in higher than average levels in Braintree, Foxborough, Plainville, Sharon, Stoughton, and Walpole. Culex pipiens/restuans populations are higher than average in Quincy once again.

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

3. COMPARISON TO PREVIOUS SEASON

The varied collections from lower to higher than average collections this week was also due to localized thunderstorms during our trapping interval as was the case last week. There was an unusually high population of Aedes vexans in Dedham, which can only be attributed to last week’s localized thunderstorm and rain events. Ochlerotatus canadensispopulations are especially high throughout the county. Overall, mosquito populations are somewhat higher than average compared to the previous seasons.

4. WEATHER SUMMARY

This was generally a quiet weather week with above normal temperatures. The only precipitation fell on July 4th during the morning where a period of light rain moved across the district. Amounts were generally between ¼ and ½ inch.

Total weekly rainfall: 0.35 inches (-0.35 in.)
Total Monthly rainfall: 0.35 inches (-0.35 in.)
Total Yearly rainfall: 15.31 inches (-6.67 in.)

5. NUMBER OF REQUESTS FOR SERVICE

NCMCD has received 3,405 calls year to date for services as of 7/06/12. The NCMCD received 469 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