Why is calibration of granular applicators more hazardous than calibration of liquid sprayers?

• A. Pesticides to be applied must be used during calibration of granular applicator
• B. Granular applicators produce more dust
• C. Calibration of granular applicators is simpler
• D. Granular pesticides are always illegal to handle during calibration

Answer: (A)

During calibration of granular applicators, you typically run the equipment with the actual pesticide product you plan to apply in order to set the correct rate and distribution. That means you’re handling concentrated, toxic material and dealing with dusty granules, which increases the risk of inhalation, dermal contact, or eye exposure. Liquid sprayers, on the other hand, can often be calibrated using water or inert tracers, avoiding exposure to the pesticide itself during the test. So the main hazard difference is exposure to the pesticide during granular calibration, not simply the presence of dust or the ease of calibration.