Lesco Aviation
Mosquitoes & Pest Control
"Aerial application of pesticides offers several advantages over ground application: You can cover large areas quickly. You can treat crops or areas (such as mid-season corn or forest stands) for which ground equipment isn’t suitable. The application cost per acre is comparatively low."  

Source: Utah Department of Agriculture, Aerial Application Pest Control, Pesticide Application and Training Guide.
"Aerial spraying to control the West Nile virus was 93 percent effective in reducing the mosquito population in eastern and southern Dallas County, according to a preliminary report Thursday."  

Source: The Dallas Morning News, 30 August 2012.