At what droplet size does spray drift become a significant concern?

The concern for spray drift is particularly significant at droplet sizes of 200 microns and below because droplets of this size are more susceptible to atmospheric conditions such as wind and air turbulence. When droplets are smaller than 200 microns, they can remain airborne for longer periods of time, increasing the likelihood of drifting away from the intended target area. This drift can lead to unintended pesticide exposure to non-target areas, including nearby crops, water sources, and even residential areas.

Furthermore, regulatory guidelines and best practices in aerial application often emphasize managing droplet size to minimize drift, making the 200-micron threshold a critical point of reference in the industry. Droplets larger than this size are generally less affected by wind currents and are more likely to fall directly to the ground, thereby reducing the risk of drift-related issues. Thus, understanding and managing droplet size is essential for effective and responsible aerial application practices.