Which of the following is NOT a type of sprayer used in pest applications?

The correct choice is the air compressor sprayer, as it is not traditionally recognized as a standalone type of sprayer specifically used for pest applications.

Backpack sprayers, hydraulic sprayers, and boom sprayers are all widely used in pest control for their effectiveness in applying pesticides over a variety of areas. Backpack sprayers are portable and allow for targeted application in gardens or hard-to-reach areas. Hydraulic sprayers utilize a pressurized system to produce a fine mist that can cover large areas quickly. Boom sprayers, on the other hand, are typically mounted on vehicles or towed and are designed to spray across wide swathes of land, making them ideal for agricultural applications.

In contrast, the term "air compressor sprayer" is not typically associated with a specific type of sprayer used in this context. While air compressors can be used to create pressure for applications in various industries, this term does not align with the conventional classifications of sprayers used in pest management or agricultural settings.