The public must help with this one. These are small, nondescript brown mosquitoes, most of which are active only at night. They breed in standing water high in organic matter, and are common in underground storm sewers and in water standing under houses built on piers. They have only a 1 to 5 mile flight range. One species can transmit St Louis Encephalitis if it bites an infected bird and then bites a human.
Residents can help by eliminating water standing around the home.
Our insecticides have no real residual effect. We must actually hit the mosquito directly with a droplet in order to kill it. If more mosquitoes fly into an area after the spray has settled, they are not effected. Obviously, it is very important to spray the right place at the right time under the right weather conditions in order to achieve control. It is very frustrating and expensive when large populations of mosquitoes are rapidly re-infesting residential areas, as repeated sprays are required.