Week 28 – July 6-12

2014 MOSQUITO REPORT: WEEK 28

Report based on data collected from traps deployed the week of July 6-12, 2014. Report prepared by Chan Suom, Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
CDC light trap activity has continued to increase as more towns are returning collections that are on par or higher than the historical average. The towns of Avon, Bellingham, Braintree, Dedham, Dover, Medfield, Millis, Needham, Randolph, Walpole, and Weymouth has notably higher than average trap collections whereas Canton, Foxboro, Franklin, Holbrook, Medway, Norfolk, Quincy, Sharon, and Wrentham reported the opposite.

Gravid Traps:
Gravid trap activity remains lower than the historical average. Only Braintree reported a higher than average population of ovipositing mosquitoes; though Bellingam, Medfield, and Norwood collected average numbers of mosquitoes.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most abundant mosquito species this week are Coquillettidia perturbans of which over 16,200 were collected from across the county. This was followed by Aedes vexans (which dropped to under 500 specimens) and Ochlerotatus canadensis (265 specimens).

Gravid Traps:
Culex pipiens/restuans are the main species in these traps and their overall population is lower than 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 mixed whereas gravid trap activity is lower than average when compared to historical data (2007-2013). Coquillettidia perturbans continues to emerge and is showing up in high numbers across the county (16,000+ specimens). Aedes vexans continues to be most active in Medfield which indicates localized flooding due to one circumstance of another despite the recent lack of rain, although we expect Huuricane Arthur’s effects will soon be felt this coming week as newly renewed habitat has had time to incubate aother brood of mosquitoes. Worthy of note is that there appeared to have been a recent emergence of Oc. canadensis in Weymouth (100+ specimens) though they should have reached the end of their reproductive cycle as they are considered a univoltine species. Our historical data along with that of the Connecticut Agricultural Experiment Station suggest that Oc. canadensis may be bivoltine instead.

Please refer to our surveillance charts for detailed trap collection data.

4. WEATHER SUMMARY

Temperatures this week averaged above normal for most of the week, except near normal Thursday into Friday after a frontal passage brought northerly winds. No precipitation was reported district-wide this week.

Total weekly rainfall: 0.00 inches (-0.69 in.)
Total Monthly rainfall: 1.62 inches (+0.43 in.)
Total Yearly rainfall: 21.03 inches (-1.44 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We had 511 calls for service this week which is a total of 4,992 service requests for the year.

6. MCP/COMMISSION RESPONSE

The District is currently responding to requests for spraying with our evening ULV application program, though requests have dropped off some. Catch basins continue to be treated in the District’s towns with some towns’ treatments having been completed at this point. Rains from Hurricane Arthur necessitated some ground larviciding at a couple of key locations. A small number of larvicide requests from residents continue to be checked as needed. The district will be treating salt marshes in the upcoming week as a result of a spring high tide on the 15th of June.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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