Which of the following is a recommended time to calibrate pesticide application equipment?

• A. Before using equipment for first time of the season
• B. When moving equipment from one site to another
• C. When replacing a broken frame on the spray rig
• D. At the end of the season only

Answer: (A)

Calibrating pesticide application equipment ensures you deliver the exact amount the label requires for the target area. Starting the season with a calibration check means you’re applying at the correct rate from day one, which helps prevent under- or over-application due to changes that can occur during storage or after maintenance.

Why this timing matters: after storage, components like nozzles, seals, and hoses can shift or drift, and pump pressure can change. Verifying and adjusting the settings before you begin spraying ensures the full-season applications are accurate from the first field. Replacing a frame or moving to a different site might necessitate checks if it affects spray output, but the most reliable moment to establish correct rates is before the season’s first use. Ending the season without calibrating misses the chance to start the next season on the right footing.

In practice, you’ll measure the actual output at your operating speed and pressure, compare it to the label rate, and adjust accordingly so that the spray volume per area matches the label's recommendation. This keeps applications effective, minimizes crop injury, and maintains safety and compliance.