When applying herbicide, which application history should one avoid?

Applying herbicide after a significant rainfall should be avoided because rainfall can significantly affect the efficacy of the herbicide. After heavy rainfall, the soil may be saturated, and the herbicide can leach away from the intended target area, reducing its effectiveness in controlling unwanted vegetation. Additionally, wet conditions can lead to increased runoff, causing environmental concerns by contaminating nearby water sources.

On the other hand, applying after mowing can help expose more of the target plant, potentially improving the herbicide's effectiveness. Low humidity can actually be beneficial as it can reduce the risk of drift and ensure that the application adheres better to the plant surface. Applying at ground level is standard practice and helps minimize drift while ensuring that the herbicide reaches its target effectively. Therefore, avoiding application right after significant rainfall is crucial for effective herbicide use.