What is a key characteristic of ULV sprayers?

• A. They apply very small droplets (5-15 microns) of concentrated insecticide using high-velocity air through a swirl chamber.
• B. They spray large droplets at high volumes.
• C. They are primarily used for larvicides in small water bodies.
• D. They require protective gear and have precise maintenance requirements.

Answer: (D)

ULV sprayers are designed to deliver pesticides in ultra-low volumes as very fine aerosols. Because those tiny droplets can stay suspended in the air and drift beyond the target area, the operation must be done with strict safety and careful upkeep. Protective gear protects the operator from inhalation and dermal exposure, and precise maintenance ensures the machine consistently produces the correct droplet size and flow. Regular calibration, nozzle and airflow checks, and following label directions are essential to both safety and effectiveness. While the other descriptions touch on how ULV systems create small droplets, the most important practical point for safe use is the requirement for proper PPE and meticulous maintenance.