The airborne movement of pesticides to non-target areas is described as

• A. drift
• B. vapor volatility
• C. runoff
• D. caused by wind

Answer: (A)

Drift describes the unintended airborne movement of pesticide through air currents during or after application, causing the spray to land on non-target areas. This term captures how droplets are carried away from the target by wind, turbulence, and spray characteristics, especially when droplets are small or conditions promote transport. Vapor volatility refers to how readily a chemical becomes a vapor, which can influence vapor-phase movement but isn’t the general term for the transport of spray droplets through the air. Runoff involves pesticides moving off the surface with water—rain or irrigation—rather than through the air. The phrase caused by wind points to the mechanism, whereas drift names the actual process of airborne transport. To minimize drift, use appropriate droplet sizes (often coarser where possible), select drift-reducing nozzles, apply at lower wind speeds, keep the spray height as low as practical, and consider weather conditions and drift-reduction additives.