Week 24 – June 11 – 12

2008 Mosquito Report: Week 24

Report based on data collected from traps deployed on Wednesday, June 11, 2008 and retrieved on Thursday, June 12, 2008. Report prepared by John Smith, Chan Suom, M.S., and Nate Boonisar.

1. Current mosquito activity/trend

CDC Light Traps:
CDC Light traps for this week show a predominance of Ochlerotatus canadensis and Ocherlotatus excrucians. Ochlerotatus abserratus numbers declined during this week’s collection. CDC Light Traps in the towns of Bellingham, Dedham, Franklin and Millis showed the most increased activity ofOchlerotatus canadensis and Ocherlotatus excrucians. Ae. vexans were collected in a few traps indicating only a minor involvement of floodplain habitat. Small numbers of Anopheles punctipennis and walkeri have also been collected most likely representing activity of over wintering adults. Culiseta melanura numbers are low, mostly in the single numbers. Well below the average for this species.

Gravid Traps:
Most of the gravid traps collected very low numbers with the exception of some of the eastern traps which are located in more urban areas. Culex pipiens/restruans collections in traps located in Canton, Dedham, Milton, Needham, Quincy and Westwood were higher than their averages. In some case several times higher than their average. Ocherlotatus japonicus collections remain low relative to the average.

2. Current Predominant Species

The predominant species this week were Oc. excrucians and Oc. canadensis.

3. Comparison to previous season

Compared to last season, activity of the predominant species (if present) is low to moderate compared to the average for each trap site.

4. Weather Summary

This week continued our stretch of fairly dry weather. The first half of the week also featured much above normal temperatures and humidity. Thunderstorms associated with a cold frontal passage Tuesday evening passed just north of the County. The remainder of the week was mainly sunny with somewhat cooler temperatures. So far this year, precipitation has been running close to normal due to above normal precip early in the year, however, it has been fairly dry over the past 60 days with rainfall averaging 2-4 inches below normal county wide, which is 50-75% of normal.

Total weekly rainfall: 0.00 inches
Total Monthly rainfall: 0.63 inches
Total Yearly rainfall: 21.75 inches

5. Number of requests for service

Year to date NCMCP has received 877 calls for service as of 6/14/08. This represents a total of 395 calls for the week. This is slightly up from last week but well below last years total for this time (2,089). Most likely the higher number of calls last year year-to-date was due to heavy summer reflood populations following late April flooding of the floodplain areas in 2007.

6. MCP/Commission response

In general our response has been to continue ground ULV applications targeting areas of high public demand. NCMCP has also begun rain basin treatments using Altosid. Field staff have been instructed to concentrate basin treatments in highly urban areas as these areas are showing the highest Culex pipiens/restruans activity based on gravid trap collections.


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