What describes the movement of water carrying pesticides from the treated area?

The movement of water carrying pesticides from the treated area is best described as runoff. Runoff occurs when precipitation or irrigation causes water to flow over the surface of the ground, which can pick up and transport pesticides from treated sites into nearby water bodies, soil, or other areas. This process is significant because it can lead to environmental contamination and affect non-target organisms and ecosystems downstream.

Runoff is especially relevant after heavy rain events or when there is excess irrigation, as it can significantly impact the effectiveness and safety of pesticide applications by extending their reach beyond the intended treatment areas. Understanding this process is crucial for applicators to implement practices that minimize off-target movement and to protect water quality.