Oklahoma Service Technician Practice Exam

What factors influence pesticide movement offsite in the air?

1. Temperature and humidity

2. Droplet size and release height

3. Soil type and moisture level

4. Surrounding vegetation and surface water

The correct answer is: Droplet size and release height

Droplet size and release height are critical factors influencing pesticide movement offsite in the air. When pesticides are applied, the physical characteristics of the droplets, such as their size, play a significant role in how far they can travel before settling. Smaller droplets can remain airborne longer and can be carried away by wind, increasing the potential for offsite movement. In contrast, larger droplets tend to fall to the ground more quickly and have a reduced risk of drift. Additionally, the release height at which the pesticide is applied affects its exposure to wind currents. Applications made at lower heights may allow for more immediate impact with ground surfaces but could also increase the probability of drift in windy conditions. Conversely, spraying from a higher elevation can disperse the droplets over a larger area, potentially allowing for further offsite movement. Together, these two factors—droplet size and release height—are paramount in assessing and managing the risk of pesticide drift, making them essential considerations for effective and responsible pesticide application.