Mosquito Numbers Still Declining

Below is the summary of recent mosquito activity in Iowa from the ISU Medical Entomology Laboratory. Mosquito surveillance data can be viewed online at www.mosquito.ent.iastate.edu    

 

Mosquito samples collected last week indicate we are on the downhill slope for floodwater mosquito (Aedes) activity all around Iowa. However, note that last week's (week 27) counts are artificially low because of the Independence Day holiday weekend (4 days' worth of mosquitoes).  However, we can see that mosquito counts declined day-by-day from last Monday through the rest of the week. Furthermore, our current collections in Ames indicate that this trend is continuing right now. For instance, a central Iowa sample from 10 days ago contained 600 mosquitoes, but one collected today had only 50.

 

Remember that mosquito activity changes quickly and is very localized.  You can check your county- or city-specific data on the surveillance website to see what's buzzing in your neck of the woods.

 

This is an interesting time of year because the mosquito fauna is becoming more diverse. The most common species are:

  • Aedes vexans - common everywhere
  • Ae. trivittatus and Ae. sticticus - other floodwater species that feed on people
  • Culex tarsalis - a West Nile virus (WNV) vector that is common now
  • Cx. pipiens - not yet very abundant, but will rise in July and is bound to harbor WNV
  • Psorophora species, large mosquitoes that are fast fliers and human feeders

As we proceed into West Nile virus "season," remember to rid lands of standing water, where the vector species breed. As a measure of personal protection, use insect repellent while outdoors. 

 

 

Mosquito populations in Iowa for the current and previous year as of July 10, 2015 according to New Jersey light trap records. Data are shown as a weekly average of traps running.Mosquito populations in Iowa for the current and previous year as of July 10, 2015 according to New Jersey light trap records. Data are shown as a weekly average of traps running.

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