Which statement is a correct definition of drift?

• A. The pesticide moves off target (even though it may have been properly applied)
• B. A pesticide mix is incorrect and mistakenly applied
• C. A pesticide changes from a solid state to a gas or vapor form
• D. A pesticide that adheres to the target

Answer: (A)

Drift is the off-target movement of a pesticide through the air after application, even when the application itself is done correctly. The statement that the pesticide moves off target captures this idea, highlighting that the chemical can travel away from where you aim due to factors like wind, droplet size, and application technique. This distinguishes drift from misapplication (getting the mix or rate wrong) and from a simple deposition on the target. It’s also separate from volatilization, which is a change in state to a gas or vapor and can contribute to off-target exposure but isn’t the definition of drift itself. Finally, adhering to the target describes proper deposition, not drift. Understanding drift helps explain why practitioners use drift-reducing nozzles, appropriate droplet sizes, and weather-aware timing to protect non-target areas.