What does runoff refer to in the context of pesticides?

Runoff, in the context of pesticides, refers to surface water that carries pesticides that have been adsorbed to the soil. When it rains or when irrigation occurs, any excess water can flow across the surface of the ground, picking up particles, including soil and any chemicals that are attached to that soil, such as pesticides. This runoff can then enter nearby water bodies, potentially leading to environmental contamination.

Understanding runoff is crucial for managing pesticide application to minimize the impact on local waterways and ecosystems. Recognizing the implications of runoff also emphasizes the importance of employing best management practices in pest control, such as proper application timing, using buffer zones, and selecting appropriate pesticides that are less likely to adhere to soil particles.