Structural Pest Control Applicator Practice Exam

Which of these additional factors does not influence drift?

1. Humidity

2. Height of release

3. Wind speed and direction

4. Reentry interval

The correct answer is: Reentry interval

Drift in the context of pesticide application refers to the movement of pesticide particles or droplets away from the target area due to environmental conditions and application techniques. The factors that typically influence drift include humidity, height of release, and wind speed and direction. Humidity plays a crucial role because it can affect the evaporation rate of pesticide droplets; higher humidity can lead to larger droplets that are less likely to drift. The height of release also impacts drift, as droplets released from a greater height have a longer distance to travel in the wind before landing, increasing the potential for drift. Wind speed and direction are perhaps the most significant factors, as stronger winds can carry droplets further from the target area, while the wind's direction will dictate where those droplets are carried. On the other hand, the reentry interval refers to the time that must pass after a pesticide has been applied before people or pets can safely enter the treated area. While this is an important safety consideration, it does not directly influence the drift of pesticide droplets during application. Reentry intervals are more concerned with human safety and exposure risk rather than influencing how far or where pesticides may drift. Thus, it is correctly identified as not impacting drift.