Week 25 – June 20-24

2011 MOSQUITO REPORT: WEEK 25

Report based on data collected from traps deployed the week of June 20, 2011 through June 24, 2011. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Mosquito activity was average to below average in most towns this week. The towns of Canton, Millis, Norfolk, Plainville, and Sharon collected higher than average numbers of mosquitoes.

Gravid Traps:
Gravid traps had higher than average mosquito collections in most towns. Only Wrentham and Medfield had a lower than average collection.

2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most active mosquito species this week were Ochlerotatus canadensis and Coquillettidia perturbans, although there were isolated high density populations of Aedes vexans.

Gravid Traps:
Culex pipiens/restuans outnumber other species in gravid traps.

3. COMPARISON TO PREVIOUS SEASON

Mosquitoes benefit from this recent weather activity of on and off rain every few days or so; and this is reflected by the higher than average occurrences of Oc.canadensis, Ae. vexans, and Co. perturbans.

4. WEATHER SUMMARY

This week started with pleasant weather, but a series of low pressure systems along a stalled front caused off and on showery weather later in the week, some of which were heavy. Total rainfall for the week ranged from around an inch in southern sections, to near two inches in northern sections. So far this month, rainfall has ranged from just under four inches in the south, to over five inches in northwest sections. This is above normal for the entire county. For the year, rainfall is near normal county-wide.

Total weekly rainfall: 1.62 inches (+0.87 in.)
Total Monthly rainfall: 4.42 inches (+1.73 in.)
Total Yearly rainfall: 22.63 inches (+1.88 in.)

5. NUMBER OF REQUESTS FOR SERVICE

NCMCP received 2,843 calls year to date for services as of 6/25/11. NCMCP received 388 calls for service this week.

6. MCP/COMMISSION RESPONSE

NCMCP began “area wide” ground ULV applications the first week of June. Weather conditions (mainly cold conditions and rain during the spray window) have delayed some of these applications. Rain basin monitoring with a Landers Ladle indicated Culex larvae present in many of the basins sampled. This in concert with higher levels of Culex collected in gravid traps has triggered our applications to rain basins as well as other retention/detention basins. NCMCP has submitted the first pools of mosquitoes to the State Arbovirus lab which were collected in week 25.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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