Mosquito Control

Rebecca Brandt, Manager

810 Livingston Avenue
Bay City, Michigan 48708-6380
Voice: (989) 894-4555
Fax: (989) 894-0526

Mosquito Surveillance

During the summer months, Bay County Mosquito Control monitors mosquito populations and mosquito-borne disease in Bay County.  Mosquito surveillance in Bay County has taken place since the late 1970's and involves collecting and identifying adult mosquito species in a variety of traps.  New Jersey light trap records for Bay County are shown for the current and previous three years.  Data are shown as a weekly total that accounts for the number of traps running.  There are 14 traps located throughout the county and the traps run three evenings per week.  Records are shown according to the week of the year with week 1 being the first week in January.  Roughly speaking, the second half of May = weeks 19-21; June = 22-26; July = 27-30; August = 31-34; September = 35-36.  The main species collected in New Jersey light traps is influenced by weather factors (rain, wind, humidity) and seasonality.  Typically, Aedes vexans, Coquillettidia perturbans, Anopheles quadrimaculatus, and Anopheles walkeri are the mosquito species captured in the highest numbers.

 

2016 Summary:  Overall, 2016 showed below-average mosquito counts, but populations spiked around Labor Day due to a hatch of floodwater mosquito species caused from a mid-August 4-inch rain event.

2017 Summary:  Flooding conditions predominated the news in June of 2017.  Over 9 inches of rain fell in our area with up to a foot falling in Midland and Isabella counties to the west.  These heavy June rains brought on a large influx of floodwater species that peaked in mid-July.  Mosquito activity was high for nearly a month afterwards.

2018 Summary:  Mosquito numbers in 2018 were near-average.  While floodwater mosquitoes did not spike until September caused by late August rains, residents especially along the Saginaw Bay were bothered earlier in the summer by both Coquillettidia perturbans (the cattail marsh mosquito) and another permanent water species, Anopheles quadrimaculatus, which accounts for the spike in week 26.+

2019 Summary:  The season started off slowly due to unseasonably cool temperatures; however, rainfall received in mid-June lead to a rise in adult mosquito numbers by Week 24.  Large populations of the cattail marsh mosquito emerged around the Independence Day holiday, but numbers of that particular species will begin to fade by the third week of July.  Dry conditions currently prevail so fewer floodwater species are being collected.