Which statement best reflects the reason to calibrate pesticide application equipment regularly?

• A. To detect changes due to wear, corrosion and aging
• B. To maximize spray pressure at all times
• C. To test the color of the spray
• D. To ensure uniform nozzles

Answer: (A)

Regular calibration keeps the actual spray output aligned with what the label specifies. Over time, wear, corrosion, and aging of parts change how much liquid each nozzle delivers. Those changes can cause the application rate to drift, leading to under- or over-application, which can reduce effectiveness or increase environmental risk. By calibrating, you catch these changes early and can adjust or replace worn components to maintain the correct rate per acre.

The other options miss the core purpose: calibration isn’t about always maximizing spray pressure, testing spray color, or merely ensuring uniform nozzles. It’s about detecting real changes in flow that affect how much pesticide is actually being applied.