Which term describes pesticide moving away from the release site in the air?

• A. Drift
• B. Fog
• C. Vapor Drift
• D. Runoff

Answer: (A)

Drift describes the airborne movement of pesticide spray away from where you applied it. When you spray, tiny droplets can be carried by wind and air currents beyond the target area, leading to off-target deposition. This is the situation the term drift is used to describe, making it the best fit for “pesticide moving away from the release site in the air.”

Context helps: finer droplets travel farther, and factors like wind speed, nozzle type, spray pressure, and application height influence how far drift occurs. To reduce drift in turf work, operators use coarser droplets, drift-reducing nozzles, proper boom height, and apply under suitable wind conditions, avoiding inversions or very windy conditions.

Other terms are less appropriate here. Fog is not a technical term for this movement, and vapor drift refers specifically to volatilization and movement of pesticide as vapor, which is a different mechanism. Runoff involves water movement, not air.