Week 24 – June 11-15

2012 MOSQUITO REPORT: WEEK 24

Report based on data collected from traps deployed the week of June 11, 2012 through June 15, 2012. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
This week’s trap collections showed that overall, trap collections were higher than usual across Norfolk County. Only Avon and Wrentham indicated lower than average mosquito host-seeking activity.

Gravid Traps:
Gravid traps were not deployed this week.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most predominant CDC trapped mosquitoes in Norfolk County this week were Culiseta melanura and Coquillettidia perturbans. Aedes vexans populations are higher than average in Bellingham and Plainville. Ochlerotatus canadensis populations are higher than average in Bellingham, Medway, Milton, Randolph, and Weymouth. Culex pipiens/restuans populations are also higher than average in Franklin, Medway, and Millis.

Gravid Traps:
Gravid traps were not deployed this week.

3. COMPARISON TO PREVIOUS SEASON

The high population of Culiseta melanura this early in the season is most likely due to the mild winter which allowed more overwintering larvae to survive. The other mosquito species benefitted from recent rainfall which may have created and maintained temporary habitats much longer than usual. Some of the Aedes vexans we are collecting are most likely left over hatches from the flooding of the Charles and Neponset rivers in April and May.

4. WEATHER SUMMARY

This week started dry and seasonable. A cold front moved across the area bringing periods of mostly light rain late Tuesday night into Wednesday. Amounts were generally between ½ and ¾ of an inch, with slightly under ½ inch in the far southwest corner of the district. Temperatures averaged below normal.

So far this month, rainfall has been between 2 and 3 inches district-wide, which is slightly above normal. Due to a much drier than normal winter, yearly rainfall continues below normal, however drought conditions have eased due to above normal rainfall in the mid to late spring.

Total weekly rainfall: 0.59 inches (-0.17 in.)
Total Monthly rainfall: 2.40 inches (+0.67 in.)
Total Yearly rainfall: 13.38 inches (-6.41 in.)

5. NUMBER OF REQUESTS FOR SERVICE

NCMCD has received 1,935 calls year to date for services as of 6/15/12. The NCMCD received 428 calls for service this week.

6. MCP/COMMISSION RESPONSE

NCMCD began “area wide” ground ULV applications May 29th. Due to cold and rainy weather conditions, no applications were completed the week of June 4-8. Cold at night has prevented applications on a few other nights. We have begun our applications to rain basins as well as other retention/detention basins.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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