Define drift in pesticide application.

• A. The movement of spray droplets away from the target area by air flow, wind, or evaporation.
• B. Movement of soil particles by tillage.
• C. The breakdown of pesticide in sunlight.
• D. The mixing of pesticides with water.

Answer: (A)

Drift is the unintended movement of spray droplets away from the target area due to air flow, wind, or evaporation. This off-target movement can affect nearby plants, people, and water bodies, and it happens when droplets are carried by wind or become smaller as they sit in the air and evaporate. The described option captures this exact idea: droplets are moved away from where you intend to spray because of wind and air currents, and they can drift before depositing. The other descriptions refer to different processes: moving soil particles by tillage is erosion, breakdown by sunlight is photodegradation, and mixing with water is just dilution or compatibility. Understanding drift helps you reduce it by choosing appropriate droplet sizes, nozzle types, application height, and applying under suitable weather conditions.