Which of the following best describes Particle Drift?

• A. Movement of pesticide in vapor or gas form
• B. Physical movement of pesticide through air
• C. Movement of spray droplets associated with application
• D. Not applicable

Answer: (C)

Particle Drift refers to the physical movement of spray droplets away from the target area as they are propelled by air currents during the application. The best choice captures that it’s the droplets leaving the nozzle and being carried downwind, which can deposit on non-target surfaces or crops. Vapors moving after volatilization are a different phenomenon, so movement of pesticide in vapor form isn’t drift. General movement of pesticide through air can happen in other contexts, but drift specifically means droplets from the spray mist moving with wind. Understanding drift helps explain why factors like droplet size, nozzle type, application height, wind speed, and temperature affect where the pesticide ends up. To minimize drift, use appropriate droplet sizes, drift-reducing nozzles, lower boom height, and apply under suitable weather conditions.