What is particle drift?

• A. Movement of liquid droplets off-target
• B. Movement of gaseous vapors
• C. Movement of solid particles by air
• D. Leaching of chemicals into groundwater

Answer: (C)

Particle drift refers specifically to the movement of tiny solid particles, such as pesticide aerosols or dust, that can be carried through the air from the area where they were applied to an unintended target. This phenomenon often occurs during the application process, especially when environmental conditions like wind are not favorable. Understanding particle drift is crucial for those applying pesticides, as it helps in minimizing the risk of affecting non-target organisms or areas.

While other options discuss related concepts—such as liquid droplets moving off-target, gaseous vapor movement, or chemicals leaching into groundwater—they do not directly define particle drift. Each aspect involves different processes and concerns in pest management, highlighting the need for awareness in pesticide application regarding air movement and the properties of the materials being used.