The operation of which type of applicator is least subject to drift considerations?

The operation of a granular applicator is least subject to drift considerations primarily because granular formulations are typically heavier and do not become airborne in the same way that liquid formulations do. Drift generally occurs when small droplets of pesticide are carried by the wind away from the intended target area. Since granular materials settle quickly to the ground upon application and do not create fine droplets that can be easily dispersed by wind, they present a lower risk of off-target movement.

In contrast, aerial sprayers and hydraulic sprayers create fine mists or droplets that can easily drift in the wind, increasing the likelihood of contamination of non-target areas. Hand-held sprayers can also create small droplets, especially if used improperly or in windy conditions. Therefore, the nature of application for granular materials significantly reduces drift risk, making it the most appropriate choice concerning drift considerations.