What is the first step in making an application with a backpack sprayer on a per area basis?

The first step in making an application with a backpack sprayer on a per area basis is to measure an appropriate test area. This step is crucial because it allows the applicator to determine the size of the area that will be treated, which is essential for calculating the correct amount of pesticide needed for effective control. Accurately measuring the area ensures that the applicator can apply the pesticide in appropriate quantities according to labeled rates.

Measuring the area allows for proper calibration of the sprayer and ensures that the pesticide is applied uniformly and effectively, minimizing waste and reducing the risk of harming non-target organisms. This foundational step is integral to responsible pesticide management and helps in achieving the desired efficacy of the treatment while adhering to safety regulations.

The other options, such as filling the sprayer or checking for leaks, are important practices but come after assessing the area to be treated so that the right amount and proper method of application can be determined.