Weekly mosquito trap counts Dane County 2018

Trap sites were chosen for specific research purposes and are not necessarily intended to monitor for mosquito activity for the entire Madison metropolitan area. The mosquito traps are run one night per week. This site is intended to provide the public with our limited data concerning the general mosquito population numbers in the area and the infection rates with West Nile virus.   Trap catches will be influenced by wind speed, temperature, humidity and precipitation.

Note: In 2018, Dane County added one trap location, Indian Springs, and a different type of trap.  Thus, results are from light/carbon dioxide traps as in prior years and from gravid traps newly located at each site.  West Nile virus surveillance will be reported for gravid trapped mosquitoes, since this is a more efficient way to detect virus.  However, it is a change from prior years, so 2018 results are not comparable to those results.

Figure 1.  Graph showing average number of mosquitoes/trap for 2012-2018. This may provide a rough idea of how active mosquitoes are during any given week in Dane County.

Table 1.  Summary of number of mosquitoes trapped at each light/carbon dioxide trap location in Dane County.

Date Carver St
Warner Pk
Strickers Pond
Carpenter Ridgeway
Arbor Drive
Paso Roble
Indian Springs
Ave/trap
6/4/2018 135 7294* 314 1581* 53 72 1686* 1590
6/11/2018 195 8 79 86 121 29 884 229
6/18/2018 TF 245 64 2444 TF 39 1504 859
6/26/2018 2094 123 460 301 0 2 >12000 2157
7/6/2018                
7/11/2018                
7/18/2018                
7/25/2018                
8/1/2018                
8/8/2018                
8/16/2018                
8/22/2018                
8/29/2018                
 9/6/2018                
9/12/2018                

*Estimated total.

**Trap fail

Figure 2.  Estimates of abundance of the WNV vector, Culex spp. by light/CO2 trapping. Gravid trapping was not done prior to 2018 so no comparisons are available.

Table 2. Summary of number of Culex pipiens/restuans trapped at each gravid trap location in Dane County.  These mosquitoes are the West Nile Virus vectors.  Gravid traps capture mosquitoes that have already fed so they are more likely to be positive for viruses than the host-seeking mosquitoes trapped in light/CO2 traps.

Date

Carver St

Warner PK Strickers Pond Carpenter Ridgeway Arbor Drive Paso Roble Indian Stprings Total

Positive Pools

6/4/2018  191  4  49  7  11  5 0 267  0
6/11/2018 54 378** 191 7 nd 28 176 834 1
6/18/2018 TF 14 74 5 47 7 65 212 0
6/27/2018 14 106 66 1 82 12 125 406 0
7/2/2018 10 25 26 2 20 34 22 139 0
7/11/2018 9 47 2 0 27 42 112 239 0
7/18/2018 4 22 0 1 47** 0 17 91 1
7/25/2018 15 13 1 8 44** 66 30 206 1
8/1/2018                  
8/8/2018                  
8/15/2018                  
8/22/2018                  
8/29/2018                  
9/6/2018                  
9/12/2018                  

**Pool positive for WNV by RAMP testing