What is a major consideration when applying pesticides near water sources?

The major consideration when applying pesticides near water sources is to avoid application to prevent contamination. This is crucial because pesticides can easily be washed away into nearby bodies of water, which can pose significant risks to aquatic ecosystems, wildlife, and potentially human health.

When pesticides enter water sources, they can harm aquatic organisms, disrupt the food chain, and contaminate drinking water supplies. Regulatory guidelines often emphasize the need to maintain a buffer zone between pesticide application areas and water sources to minimize these risks. By prioritizing the protection of water bodies, pesticide applicators can help safeguard the environment, promote biodiversity, and adhere to legal and ethical standards regarding pesticide use.

In contrast, using higher concentrations for effectiveness could lead to unintended runoff and increased toxicity in water systems. Mixing pesticides with fertilizers may not be appropriate as it could create a compound effect of both substances on water quality, while applying at night does not necessarily mitigate the risk of drift or runoff associated with pesticide application.