Week 38 – Sept 18-24

2011 MOSQUITO REPORT: WEEK 38

Report based on data collected from traps deployed the week of September 18, 2011 through September 24, 2011. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Host-seeking mosquito activity has returned to generally normal and average levels, although some sites are still abundant with mammalophilic mosquitoes as a result of previous rain events: Canton, Holbrook, Millis, parts of Sharon, and parts of Weymouth. Medway and Walpole collected lower than average numbers of mosquitoes this week.

Gravid Traps:
Gravid trap mosquito collections are mostly lower than average this week as seen in Avon, Dedham, Holbrook, Franklin, Millis, Milton, Needham, Norwood, Randolph, Walpole, Westwood, and Wrentham. The remainder of traps indicate average activity for this time of season.

2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
Aedes vexans populations have dwindled down in most of the county and are mainly concentrated in areas prone to flooding such as our Canton trap site. Psorophora ferox continue to be overabundant in Canton and Weymouth. Ochlerotatus canadensis mosquitoes are higher than average in Sharon once again. There are reports by our field crew and a supplemental trap has indicated an outbreak of Oc. canadensis in certain parts of Bellingham. Culiseta melanuranumbers have come down in most parts of the county but continue to be plentiful in Holbrook, Millis, and Weymouth.

Gravid Traps:
Gravid Culex pipiens/restuans mosquito populations are mostly below average this week. Oc. japonicus populations are notable in Avon, Medway, and Randolph.

3. COMPARISON TO PREVIOUS SEASON

The spate of wet weather these past few weeks have created plenty of suitable habitat and facilitated the emergence of mammalophilic mosquitoes. As the weeks have drawn closer to the end of our surveillance season, the numbers of mosquitoes have tapered off and are mainly concentrated in flood zones rather than throughout the county. Night time temperatures will be cooler this forthcoming week and should return fewer mosquitoes in our traps for the week.

4. WEATHER SUMMARY

No weather report available this week.

5. NUMBER OF REQUESTS FOR SERVICE

NCMCP received 7,598 calls year to date for service. NCMCP has discontinued recording calls from residents requesting ULV applications.

6. MCP/COMMISSION RESPONSE

NCMCP discontinued all county wide early morning ground ULV applications due to the long range forecast of unfavorable weather conditions. In response to the collection of two EEE positive pools of Ochlerotatus canadensis in the town of Sharon, NCMCP conducted a ULV application (starting at 8 p.m.) in Sharon on Tuesday, September 21, 2011. Adult mosquito surveillance (Gravid Traps and Light Traps) will continue through the end of the month. NCMCP personnel have shifted operations to water management activities. Public outreach continues in all member communities relative to personnel protection as the possibility of continued control measures begins to diminish with the approach of more fall like weather conditions.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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