The movement of spray particles produced during application is called which term?

• A. Drift
• B. Endophyte
• C. Drought
• D. Even flat-fan pattern

Answer: (A)

Spray drift is the movement of spray particles away from the target during application. It occurs when droplets are carried by air currents and settle on non-target surfaces, which can reduce effectiveness where you want the pesticide and create unintended exposure elsewhere. Understanding drift helps explain why the size of droplets matters— smaller droplets stay suspended and travel farther, while larger droplets are heavier and settle more quickly. Wind speed and direction, nozzle type and pressure, spray height, and weather conditions all influence how much drift occurs. To minimize drift, use larger droplets when possible, choose drift-reducing nozzles, keep spray height as appropriate, lower pressure, and avoid applying in windy or unstable conditions. Endophyte refers to a plant-associated microorganism, not to spray movement. Drought describes a lack of water, not spray behavior. Even flat-fan pattern describes a nozzle’s spray distribution, not the mechanism that moves droplets through the air.