What is the result of applying a pigment inhibitor to emerging weeds?

Applying a pigment inhibitor to emerging weeds disrupts their ability to produce chlorophyll, the pigment necessary for photosynthesis. As a result, these weeds begin to lose their green color and often turn white or yellow due to the lack of chlorophyll production. This discoloration indicates that the weeds are unable to effectively engage in photosynthesis, which ultimately weakens them and leads to their death.

The action of pigment inhibitors targets the biosynthetic pathway responsible for chlorophyll production, making it a useful tool for managing unwanted vegetation. The visual change in color serves as a clear indicator of the herbicide's effect and its effectiveness in suppressing weed growth. Thus, the outcome of applying a pigment inhibitor is primarily the whitening of the weeds before they succumb to the chemical's effects.