What is the danger of applying pesticides during rain?

Applying pesticides during rain carries significant risks, primarily due to the increased likelihood of runoff and the potential for reduced effectiveness of the pesticide. When rain falls soon after application, it can wash the pesticide off the target area, leading to contamination of nearby water sources and non-target plants. This runoff can exacerbate environmental concerns and harm beneficial organisms in the vicinity.

Additionally, rain can dilute the pesticide on the target plants or soil, reducing its concentration to levels that may not effectively control the pests for which it was intended. Achieving optimal pesticide efficacy often requires the product to remain undiluted on the surface where it was applied, allowing time for it to be absorbed or take effect. Consequently, weather conditions such as rain can undermine the entire purpose of the application, highlighting the critical need to monitor weather forecasts and avoid treating during such conditions.