Iowa Aerial Applicators Practice Test

Driftable fines refer to small particles that can easily be carried away by wind during aerial application of pesticides and other materials. These particles typically fall within a specific size range that makes them susceptible to drift, which can reduce application effectiveness and cause unintended exposure to non-target areas.

The correct size range classified as driftable fines is from 10-50 microns. Particles in this range are small enough to be easily lifted by air currents and remain airborne for extended periods, thereby posing a risk of drift beyond the intended application site. Understanding the size of driftable fines is crucial for applicators to manage and mitigate drift potential, ensuring effective applications while adhering to safety protocols and regulations.

Other size ranges provided in the options do not correspond to driftable fines. Particles larger than 50 microns are less likely to drift and more likely to settle quickly due to gravity, making them less of a concern in terms of drift management. Hence, recognizing the right size range is essential for responsible aerial application practices.