Week 39 – Sep 22-28

2013 MOSQUITO REPORT: WEEK 39

Report based on data collected from traps deployed the week of September 22-28, 2013. Report prepared by Chan Suom, M.S., Dave Lawson, and Nate Boonisar.

1. CURRENT MOSQUITO ACTIVITY/TREND

CDC Light Traps:
The cooler weather has continued to keep host-seeking mosquito populations at an average level. Only Holbrook reported lower than average numbers of mosquitoes.

Gravid Traps:
Gravid traps continue to report average numbers of ovipositing mosquitoes throughout the county for the week. Bellingham and Franklin were the only towns to collect higher than average numbers of mosquitoes.

 2. CURRENT PREDOMINANT SPECIES

CDC Light Traps:
The most abundant mosquito species this week are Aedes vexans and Culex pipiens/restuans.  At this point in the season, there does not appear to be any new activity and we expect any activity to decline as the weeks pass and the evening temperature continues to drop.

Gravid Traps:
Culex pipiens/restuans are predominant in these traps and their overall population is average for this time of the season.

3. COMPARISON TO PREVIOUS SEASON

The overall mosquito population for host-seeking mosquitoes in CDC light traps and gravid traps is average. In terms of abundance, we are seeing mainly Aedes vexans and Culex pipiens/restuans. The cooler evening trapping period has had a dramatic effect not on just the population of mosquitoes compared to previous weeks, but also on most mosquito species. Most CDC light traps averaged only about two to three species. With our recent lab results, it is fair to say that West Nile virus is present throughout our whole county. Even if a few towns have not had positive isolations, the surrounding areas have gone positive. As stated in a previous report, even though mosquito populations are low, the prevalence of virus activity is higher during this time of the season, therefore caution is advised during outdoor activity, especially in the evening.

4. WEATHER SUMMARY

Temperatures this week average near normal. The only rain occurred during the pre-dawn hours on Sunday when a cold front brought a band of showers to the area. Amounts were generally ¼ to ½ inch (locally higher). Rainfall for September has averaged 50-75% of normal across the district except for a small area in the north-central section with above normal rain due to the excessive rainfall they received Labor Day weekend.

Total weekly rainfall: 0.47 inches (-0.35 in.)
Total Monthly rainfall: 2.70 inches (-0.53 in.)
Total Yearly rainfall: 32.47 inches (+1.53 in.)

5. NUMBER OF REQUESTS FOR SERVICE

We have stopped taking requests for service for the remainder of the year. For 2013, we’ve had a total of 11, 520 service requests for the year.

6. MCP/COMMISSION RESPONSE

The NCMCD has suspended all larvicide and ULV applications for the season due to consistently low temperatures. The focus of the district now shifts to water management work until spring. We have also ended our surveillance program as of this week as trap collections have not been very productive.

Contact

144 Production Rd, Suite C

Walpole, MA 02081

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