In what situation is spraying pesticides not advisable?

Spraying pesticides in wet weather is not advisable because rain or high humidity can wash the chemicals away before they have a chance to effectively adhere to or penetrate the surfaces they are intended to treat. Wet conditions can lead to reduced efficacy and may also contribute to environmental runoff, potentially contaminating nearby water sources and harming non-target organisms.

In addition, wet conditions can increase the potential for pesticide drift, as wind can carry spray droplets away from the target area, leading to unintended exposure of sensitive plants, wildlife, or even people. Therefore, applying pesticides during dry conditions is recommended to ensure optimal results and minimize environmental impact.