Vapor drift is the movement of pesticide vapor produced after deposition. What term describes this phenomenon?

• A. Vapor drift
• B. Drift
• C. Endophyte
• D. Environment

Answer: (A)

Vapor drift is the off-target movement of a pesticide in its vapor form after it has volatilized from the treated surface. The statement describes this exact phenomenon, so this term is the best fit. Drift, in a broader sense, includes all off-target movement of pesticides, such as spray droplets, not specifically volatilized vapors after deposition. Endophyte and environment are not related to the process of volatilization and vapor movement. Understanding vapor drift matters because volatile pesticides can travel with air currents beyond the target area, especially under warm, windy conditions, increasing the potential for unintended exposure.