Week 28 – July 7-13

2013 MOSQUITO REPORT: WEEK 28

Report based on data collected from traps deployed the week of July 7-13, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
CDC light traps from almost all towns continue the trend of higher than average numbers of mosquitoes. Only Avon and Wrenthamhad lower than average collections.

Gravid Traps:
Gravid mosquito collections are ramping up in the number of ovipositing Culex pipiens/restuans collected. Most towns have a higher than average collection of gravid mosquitoes except for Norwood, which reported a lower than average collection.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
We are still seeing an incredibly high number of Aedes vexans, Psorophora ferox, and Coquillettidia perturbans. Ochlerotatus canadensis populations are highest in Holbrook, Medfield, Millis, and Walpole. Our Canton collection has finally come down from record highs from the previous weeks’ collections; though this week netted over 3,000 mosquitoes in a trap night (~2,000+ FER). Dedham collected 2,000+ PER; and more than 1,000+ PER were collected in Franklin, Millis, and Norfolk. Our new Medfield location indicates a coming rise of the Culiseta melanura population that will eventually be reflected in other towns in the coming weeks.

Gravid Traps:
Culex pipiens/restuans are predominant in these traps and their numbers had increased substantially over the past few weeks.

3. COMPARISON TO PREVIOUS SEASON

The overall mosquito population for this week is above average compared to the historical averages for each town. Along with the constant humidity, the past rainfalls and flooding events have really exacerbated this outbreak. Continued heat and humidity for the upcoming week will only add to the situation in which we will receive higher service requests than normal.

4. WEATHER SUMMARY

Temperatures this week were near normal during the day for the most part, however due to continued high humidity, nighttime low temperatures were above normal. There were scattered showers/thunderstorms at times with localized heavy rain, but otherwise no widespread soaking rains. Total weekly amounts were generally ¼ to ½ inch district-wide. Lesser amounts as low as a tenth of an inch occurred around Foxborough, while ¾ of an inch fell near Milton, and an isolated 1.5 inches in Bellingham.

Total weekly rainfall:  0.52 inches (-0.17 in.)
Total Monthly rainfall:  0.52 inches (-0.77 in.)
Total Yearly rainfall: 25.27 inches (-2.70 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We received 1,030 service requests this week, with a total of 5,700 service requests for the year. Last week (June 30-July 6), we received 1,297 service requests.

6. MCP/COMMISSION RESPONSE

The Norfolk County Mosquito Control District continues to be inundated with phone calls from residents in neighborhoods adjacent to the Neponset and Charles River floodplains, following significant floods that peaked on June 7th. The district continues to respond to requests with ULV applications. Residents also continue to request ground larvicide applications in response to standing water that is everywhere after the second/third wettest June on record.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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