What term describes the physical movement of a pesticide through air at the time of application or soon after to off-target sites?

• A. Vapor Drift
• B. Drift
• C. Particle Drift
• D. Non-Target Movement

Answer: (B)

Drift is the movement of a pesticide through the air away from the target area during application or shortly after. It covers the off‑target transport that occurs because air currents carry the spray droplets or volatilized compounds to places you don’t intend to treat. Vapor drift refers specifically to movement in the vapor form, and particle drift refers to the movement of spray droplets; the question’s description matches the general phenomenon of drift, which is why that term is the best fit. In practice, understanding drift helps you apply practices that minimize off-target exposure, such as using appropriate droplet sizes, proper nozzle height, and favorable weather conditions.