Week 32 – Aug 5-11

2012 MOSQUITO REPORT: WEEK 32

Report based on data collected from traps deployed the week of August 5-11, 2012. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Host-seeking trap collections are reporting a return to normal mosquito populations as most traps are returning average numbers of mosquitoes. Bellingham, Braintree, Dedham, Foxborough, Quincy, and Walpole reported higher than average collections whereas Franklin, Holbrook, Medfield, and Medway had lower than average collections.

Gravid Traps:
This trapping interval continues to show a downward population trend of gravid mosquitoes for Norfolk County. A few sites returned average collections whereas Medway and Norfolk collected higher than average numbers of Culex pipiens/restuans.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week were Coquillettidia perturbans, with populations higher than average in Foxborough and Wrentham once again. Aedes vexans populations are average to below average, despite previous rain events.  Culex pipiens/restuans numbers are higher than average in Bellingham, Dedham, and Quincy. Culiseta melanura populations are high only in Braintree.

Gravid Traps:
Though their populations are low, Culex pipiens/restuans are the most predominant species in gravid traps throughout Norfolk County.

3. COMPARISON TO PREVIOUS SEASON

Compared to historical averages, mosquito collections this week are about average for host-seeking traps. Gravid traps are seeing fewer than average numbers of ovipositing Culex pipiens/restuans which would seem to indicate that there are fewer successful, bloodfed mosquitoes; which in turn supports this low population trend of Culex pipiens/restuans in both gravid and host-seeking traps. This would be counterintuitive since Cx. pipiens/restuans should have fared better in these drought conditions because they have inhabot more permanent bodies of water compared to vernal pool species. In any event, these species are also affected by this season’s drought conditions as even some Culiseta melanura habitat, which used to produce healthy numbers of mosquitoes, are currently dry.

4. WEATHER SUMMARY

Not available this week.

5. NUMBER OF REQUESTS FOR SERVICE

NCMCD has received 6,650 calls year to date for services as of 8/10/12. The NCMCD received 702 calls for service this week.

6. MCP/COMMISSION RESPONSE

The NCMCD continues to respond to ULV requests by residents. With the recent finding of multiple EEE positive pools of Cq. perturbans in Canton, the District has stepped up additional ULV applications in Canton and Randolph. Basin treatments have been completed in some communities and continue in other municipalities. Very few larvicide requests are being initiated at this time.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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