Week 26 – June 23-29

2013 MOSQUITO REPORT: WEEK 26

Report based on data collected from traps deployed the week of June 23-29, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Due to the recent flood and rain events in combination with ideal weather for mosquitoes, we are collecting many more specimens throughout the county in comparison with the historical average. Activity is quite high in Avon, Canton, Dedham, Dover, Foxborough, Holbrook, Millis, Milton, Needham, Norfolk, Norwood, Plainville, Stoughton, Walpole, Westwood, Weymouth, and Wrentham.

Gravid Traps:
Gravid mosquito collections are average to lower than average for most of the county. Only Needham collected a higher than average number or Culex pipiens/restuans.

2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
We are seeing an incredibly high number of Aedes vexans, Psorophora ferox, and Coquillettidia perturbans. The Canton location collected over 13,000 mosquitoes in one trap night: 8,800+ Ae. vexans and 4,600+ Ps. ferox! Dedham collected almost 3,000 Cq. perturbans and 1,800+ Ae. vexans! Foxborough collected 4,700+ Cq. perturbans and 1,100+ Ae. vexans!

Gravid Traps:
Culex pipiens/restuans are predominant in these traps, though their populations are depreessed throughout the county.

3. COMPARISON TO PREVIOUS SEASON

The overall mosquito population for this week is above average compared to the historical averages for each town. The rainfalls and flooding events have really exacerbated this outbreak.

4. WEATHER SUMMARY

The main rainfall this week came from scattered thunderstorms (mainly east) on Monday, and more widespread showers Friday night into Saturday. Total rainfall for the week ranged from as low as ¼ inch in the west to over an inch locally in the east. June rainfall has been nearly three times normal district-wide, with widespread amounts over 10 inches. Temperatures this week were above normal, along with fairly high humidity.

Total weekly rainfall: 0.51 inches (-0.23 in.)
Total Monthly rainfall: 10.02 inches (+6.91 in.)
Total Yearly rainfall: 24.75 inches (+3.62 in.)

5. NUMBER OF REQUESTS FOR SERVICE

The NCMCD has received 789 service requests this week, with 3,373 total service requests at this point.

6. MCP/COMMISSION RESPONSE

The Norfolk County Mosquito Control District is being 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. Basin treatments are being conducted as well even though we have not found larvae yet in limited basin dipping. We are using briquette products that will last the season as we try to get on schedule with treatments for the whole district.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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