What impact can weather conditions like rain and wind have on herbicide application?

Weather conditions such as rain and wind significantly influence the effectiveness and safety of herbicide application. Rain shortly after application can lead to herbicide runoff, diminishing its efficacy by washing the chemical away before it has had an opportunity to properly adhere to the target plants. This can prevent the herbicide from reaching its desired area of action, rendering it less effective. Conversely, if it is too windy during application, drift can occur, meaning the herbicide may be carried away from the target area, potentially affecting non-target plants and environments. This can lead to unintended crop damage or harm to beneficial vegetation, raising concerns about safety and environmental impact. Overall, these weather conditions must be carefully considered to ensure that herbicides are applied effectively and responsibly.