Why do I see mosquitoes on my street the day after adulticide spraying was done?
There are several reasons why you might see mosquitoes the day after adulticide spraying. The mist of pesticide cannot reach all mosquitoes, so you could be seeing ones that were active at the time of spraying, but did not come in contact with the droplets of pesticide. Some of the mosquitoes you see may have just emerged from their breeding sites. Also, different kinds of mosquitoes are active at different times of the day. Since adulticide spraying for West Nile virus is usually done late in the evening, those species of mosquitoes not active at that time would not be affected by the spraying.
