Those "adulticides" can affect animals and humans, as well the household use of similar products is under review by the U.S. Environmental Protection Agency.
Dan Hansen, "West Nile virus piques interest in disease-bearing mosquitoes," The Associated Press, April 23, 2003
Adulticiding, which is the spraying or "fogging" of insecticide against flying adult mosquitoes, will only be used as a last resort. Public health units will be able to retain mosquito control personnel on a standby basis in case they are needed.
"Eves government combats West Nile virus with mosquito control plans," Canada NewsWire, April 8, 2003
Jane E. Brody, "Mosquito: The enemy reveals its ways," The New York Times, July 12, 1983
Today's word isn't all that new, as the earliest citation shows, but it has become quite popular, with dozens of citations popping up so far this year alone. Subscriber Jack Kapica spotted the use of adulticide as a verb as well as adulticider.
Larvicide pesticide aimed at insects in the larval stage is much older, dating back to the 1920s (when a company called Soweco trademarked the term "Larvacide"). For completeness, those insects that go through a pupa, or cocoon, stage, can be targeted with a pupicide (1998).