How is the amount of pesticide applied to a site commonly expressed?

The amount of pesticide applied to a site is most commonly expressed as the application rate. This term specifically refers to the quantity of pesticide intended for use over a given area, typically expressed in units such as gallons per acre, pounds per acre, or liters per hectare. The application rate provides essential information for effective pest control while minimizing potential environmental impacts and adhering to label recommendations.

Other options like volume per weight, concentration, and dosage represent different concepts in pesticide application. Volume per weight refers to a mixture ratio but does not directly indicate how much pesticide is applied to an area. Concentration typically describes the strength of a solution but lacks the context of area coverage. Dosage is often used in medical or human health contexts, referring instead to the amount per body weight, which does not apply in the same way to agricultural scenarios.