Week 26 – June 27-July 1

2011 MOSQUITO REPORT: WEEK 26

Report based on data collected from traps deployed the week of June 27, 2011 through July 1, 2011. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
Mosquito host-seeking activity was mixed in this week’s catch. The towns of Braintree, Bellingham, Dedham, Holbrook, Medfield, Medway, Needham, Walpole, and Wrentham reported lower than average mosquito activity. Avon, Foxboro, Plainville, Milton, Quincy, Stoughton, and Weymouth had average levels of activity; whereas Canton, Franklin, Millis, Norfolk, and Sharon indicated higher than average levels of biting mosquito activity.

Gravid Traps:
Gravid traps returned with an explosion in numbers compared to historical data. Only Millis had lower than average activity while Braintree, Foxboro, Holbrook, Milton, Norfolk, Randolph, and Wrentham collected average numbers of gravid mosquitoes.

2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most active mosquito species this week were Coquillettidia perturbans whose population didn’t go unnoticed in Canton, Franklin, Millis, Needham,Norfolk, and one site in Walpole. Aedes vexans were collected in higher than average numbers in the towns of Canton, Millis, and Sharon. Ochlerotatus canadensis populations remain high in Avon and Sharon.

Gravid Traps:
Gravid Culex pipiens/restuans mosquitoes had a population explosion this week with a higher than average collection.

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 in the mentioned towns. This week’s CDC trap collections were definitely affected by the cooler evening temperatures the evening these traps were set as the scattered numbers for host-seeking activity indicate. Co. perturbans continues the trend of being very plentiful around the 4th of July and will presumably continue in high numbers for a few more weeks if the historical data is any indication.

4. WEATHER SUMMARY

This week featured near normal temps, and little precipitation. The only precipitation was some light showers on Friday that gave trace amounts to around a tenth of an inch county-wide. June ended with monthly rainfall of between three and five inches of rain county-wide (lowest in the south, highest in the west), which is mainly above normal (near normal in the south).

Total weekly rainfall: 0.12 inches (-0.61 in.)
Total Monthly rainfall: 4.42 inches (+1.20 in.)
Total Yearly rainfall: 22.75 inches (+1.27 in.)

5. NUMBER OF REQUESTS FOR SERVICE

NCMCP received 3,418 calls year to date for service as of 7/1/11. NCMCP received 583 calls for service this week.

6. MCP/COMMISSION RESPONSE

NCMCP continues “area wide” ground ULV applications in high request areas and in areas where collection data indicate a need. Rain basin treatments have begun with a concentration in urban areas where West Nile virus has been collected historically. As is noted in Chan’s report, higher levels of Culex(PRE) have been collected in gravid traps. This has triggered our applications to rain basins as well as other retention/detention basins especially in eastern areas of the county. Deer flies (Tabanids) have begun to emerge and are quite numerous in certain wooded areas within the county. Culicoides are also numerous in some coastal areas.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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