Is it permissible to apply pesticides during rainfall?

Applying pesticides during rainfall is generally not advisable because it can lead to significant runoff, which diminishes the effectiveness of the pesticide. When rain falls immediately after application, the pesticide may wash away from the targeted area, leading to inadequate pest control and potential contamination of water sources. Furthermore, runoff can carry chemicals into non-target areas, which raises environmental and safety concerns.

While there are pesticides designed for wet conditions that might work effectively when applied in light rain, the safest practice is to avoid application during any precipitation. Heavy rainfall would exacerbate these issues even further, but the core reason for prohibiting pesticide application during rain remains rooted in the potential for runoff and ineffectiveness. Thus, the emphasis on avoiding pesticide application during rainfall aligns with both agronomic practices and legal regulations designed to protect both the environment and public health.