Which application method is associated with aerial application?

Aerial applications refer specifically to the process of applying chemicals or treatments from an aircraft, such as a plane or helicopter. This method allows for efficient coverage of large areas, particularly in aquatic environments where reaching certain locations on foot or by boat may be impractical or time-consuming. Aerial application is used to manage aquatic pests over expansive water bodies, ensuring uniform distribution and minimizing labor costs.

The other methods mentioned, such as handgun spraying, subsurface injections, and bottom placement or deep-water injection, are ground-based techniques that involve direct application of chemicals to targeted areas. These methods are often used for more localized pest management and typically cannot cover large scales like aerial techniques can. Each of these alternatives is focused on different application scenarios that do not involve the use of an aircraft, thus differentiating them from aerial applications.