Illinois Aerial Application Practice Test

Driftable fines are defined as droplets within the size range of 50 to 200 microns. This size category is significant in aerial applications because particles within this range are small enough to be affected by wind and environmental conditions, leading to potential drift away from the intended treatment area.

Understanding this range is crucial for applicators as it helps them make informed decisions about nozzle selection, spray pressure, and application timing to minimize off-target movement and enhance the efficacy of the applied materials. Properly managing driftable fines is essential for protecting non-target areas, reducing environmental impact, and ensuring compliance with regulations.

Droplets smaller than 50 microns are likely to drift significantly, while those larger than 200 microns are less prone to off-target drift but may not provide adequate coverage for certain applications. Therefore, the specific focus on the 50 to 200 micron range is driven by the need to balance effective application with drift risk.