Wisconsin Commercial Pesticide Applicator Practice Test

The recommendation against using foliar sprays for large brush due to drift potential is sound because large brush areas often expose the application to environmental conditions that can lead to drift. Drift occurs when pesticide particles move away from the intended target area, which can happen easily in large, open spaces where wind can carry droplets away from the plants being treated. This can not only reduce the effectiveness of the pesticide application but also pose risks to nearby nontarget plants, wildlife, and water sources.

In contrast, using foliar sprays in other scenarios might be more acceptable. For seedlings, while caution is necessary, they can sometimes be treated effectively if done carefully, ensuring minimal drift and proper targeting. Similarly, when rain is forecasted, it is advisable to avoid foliar applications to prevent wash-off, but this depends on timing and weather conditions. Small grassy areas can often be treated efficiently without significant drift issues, making foliar applications suitable in those instances.