QAL Laws & Regulation Practice Exam

Which two factors are most critical for pesticide applicators to avoid spray drift?

1. Droplet size and wind direction/speed

2. Air stability and temperature

3. Temperature and pesticide volatility

4. Pesticide volume in spray tank

The correct answer is: Droplet size and wind direction/speed

The most critical factors for pesticide applicators to avoid spray drift are droplet size and wind direction/speed. Droplet size plays a significant role in how far and where the pesticide spray will travel once it is released from the applicator. Smaller droplets are more susceptible to being carried away by wind, which can result in unintentional drift to nearby areas, potentially harming non-target plants, animals, and humans. On the other hand, larger droplets tend to settle closer to the target area and are less influenced by wind, making them a preferable choice for applications when less drift is desired. Wind direction and speed are equally important because the force and direction of the wind will determine where the sprayed droplets will land. If the wind is strong or erratic, it increases the risk of drift significantly. Understanding the prevailing wind conditions allows applicators to plan their application timing and techniques accordingly to minimize this drift risk. Together, these factors are pivotal in ensuring that pesticide applications are effective while minimizing environmental impacts and adhering to safety regulations. The other factors mentioned in the other options, while relevant to broader pesticide application practices, do not directly influence the immediate risk of spray drift as decisively as droplet size and wind conditions do.