At what droplet size does spray drift begin to become a concern?

Spray drift is a significant concern in aerial application, as it can lead to unintended pesticide deposition on non-target areas, including nearby crops, water bodies, and sensitive habitats. The threshold at which spray drift starts becoming a potential issue typically aligns with droplet sizes smaller than 200 microns.

Droplets of this size can be carried by wind currents over considerable distances, increasing the likelihood of drift. Proper droplet size is critical for effective pest management while minimizing environmental impact. Larger droplets, around 200 microns or greater, are more likely to fall to the ground close to the intended target area due to their weight and reduced susceptibility to wind forces.

In contrast, smaller droplet sizes, especially those around 100 microns, present a higher risk of drift. Hence, while 150 microns might still pose a concern, it is at 200 microns that spray drift becomes a notable risk that aerial applicators must manage effectively to ensure compliance with safety and environmental guidelines.