Mosquito Numbers are a Mixed Bag

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 


 


Last week it appeared that the floodwater mosquitoes were loosening their grip on us.  However, this changed in the past week as numbers seemed to explode in many pockets of central Iowa.  Some New Jersey light traps in Des Moines were collecting over a thousand mosquitoes per night last week. However, this was a temporary occurrence as mosquito trap yields dropped toward the end of the week. Additionally, the recent weekend's samples and current collections in Ames suggest that they are dropping further.


 


Mosquito counts at the rest of the state's trap sites have been consistently low. Therefore, the rise in the Iowa mosquito activity graph (below) shows an increase in the statewide average of mosquito counts, but the uptick is due solely to central Iowa collections.


 


This slight surprise in mosquito activity is a good reminder that populations can vary greatly from place to place and from time to time.  Mosquito trap catch information can be viewed by clicking on "County" in the left hand margin on the mosquito surveillance website


 


Over 100 pools of mosquitoes have been tested this year for West Nile virus.  None have tested positive.


 


Mosquito populations in Iowa for the current and previous year as of July 24, 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 24, 2015 according to New Jersey light trap records. Data are shown as a weekly average of traps running.

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