Week 24 – June 8-14

2014 MOSQUITO REPORT: WEEK 24

Report based on data collected from traps deployed the week of June 8-14, 2014. Report prepared by Chan Suom, Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
This first week of trapping indicates that the overall mosquito population is lower than average for most towns in our county. Dover, Medfield, Needham, Plainville, Westwood, and Weymouth had higher than average collections whereas Dedham, Holbrook, Norwood, Sharon, and Stoughton reflected their respective historical averages.

Gravid Traps:
Gravid traps were also deployed alongside CDC light traps this week. The overall picture for ovipositing mosquitoes (Culex pipiens/restuans in particular) is average, whereas Avon, Canton, Franklin, Medway, Needham, Quincy, and Weymouth are reporting higher than average abundance.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most abundant mosquito species this week are Ochlerotatus canadensis, Culiseta melanura, Oc. cantator, Coquillettidia perturbans, and Aedes vexans.

Gravid Traps:
Culex pipiens/restuans are the main species in these traps and their overall population is 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 the historical average whereas gravid trap activity is mostly average.

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

4. WEATHER SUMMARY

Temperatures this week averaged near normal overall, but with above normal temperatures at each end of the week, with below normal temperatures in the middle. There were two periods of rainfall during the week. Scattered heavy showers occurred on Tuesday afternoon dropping locally a half inch of rain, while other areas received little rainfall.  More significant rain fell on Friday, but amounts were variable. One to two inches fell across the western towns in the district, with around a half inch in the far eastern towns, with ¼ to ½ inch in the middle. Overall for the month, rainfall is generally running below normal across the district except for the western towns where rainfall is normal to slightly above normal.

Total weekly rainfall: 0.63 inches (-0.13 in.)
Total Monthly rainfall: 1.46 inches (-0.05 in.)
Total Yearly rainfall: 19.41 inches (-0.16 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We had 683 calls for service for this week and a total of 2,489 service requests for the year so far.

6. MCP/COMMISSION RESPONSE

The District is currently responding to requests for ULV applications with our evening ULV application program. Catch basins are being treated in the District’s towns. Requests from residents for ground larvicide applications are continuing, but the majority of these requests are now revealing sites that are drying up, or are devoid of mosquito larvae. Salt marshes will be larvicided during the week of June 16 in response to a spring high tide on June 15th.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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