Week 32 – Aug 3-9

2014 MOSQUITO REPORT: WEEK 32

Report based on data collected from traps deployed the week of August 3-9, 2014. Report prepared by Chan Suom, Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
CDC light trap collections returned mostly average to below average numbers of host-seeking mosquitoes from Norfolk County. Only the towns of Bellingham, Dedham, Dover, Millis, Randolph, and Weymouth reported higher than average levels of biting activity. We had trap malfunctions in Needham, Quincy, and Westwood; therefore no data is available for those respective towns.

Gravid Traps:
Even with a fresh brew of oviposition attractant solution, gravid trap activity continues to be lower than the historical average for most towns. We had trap malfunctions in Plainville and Randolph therefore data for these towns are not available.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most abundant mosquito species this week are Coquillettidia perturbans of which approximately 3,000 were collected from across the county. Aedes vexans figures remain relatively stable from last week’s figures.

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 lower than average when compared with the historical average (2007-2013). Coquillettidia perturbans populations have essentially doubled from last week’s collection with indications of recent emergences as evidenced by mite-riddled specimens. Aedes vexans populations are stable and active.

Gravid trap collections have been lower than average thus far this season. A refreshed brew of mosquito oviposition attractant solution has not yielded an increase in trap counts of gravid mosquitoes.

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

4. WEATHER SUMMARY

Temperatures this week averaged above normal early in the week, then lowered to near normal for the remainder of the week after the passage of a cold front. Precipitation came from localized thunderstorms on Wednesday and Thursday. Over the two days, the heaviest rain fell from storms over stretching from Bellingham to Wrentham, and across S. Weymouth where up to a half inch fell. Otherwise the remainder of the district was either dry or received under a quarter inch of rain.

Total weekly rainfall: 0.31 inches (-0.42 in.)
Total Monthly rainfall: 0.39 inches (-0.55 in.)
Total Yearly rainfall: 24.02 inches (-1.25 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We received 435 calls for service this week. We have recorded a total of 6,892 service requests for the year.

6. MCP/COMMISSION RESPONSE

The District is currently responding to requests for spraying with our evening ULV application program. Catch basins continue to be treated in a few of the District’s towns with a majority of the towns’ treatments having been completed at this point. A small number of larvicide requests from residents continue to be checked as needed. The District is currently conducting some ‘low-flow’ water management projects.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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