What is the primary function of contact herbicides?

Contact herbicides are specifically formulated to kill plants by coming into direct contact with their tissues. This type of herbicide works on the principle that when it is applied to the foliage, stems, or other above-ground parts of the target plant, it disrupts essential cellular functions, leading to the death of the plant.

Unlike systemic herbicides, which are absorbed into the plant and travel through the vascular system to target roots and other areas, contact herbicides act quickly and effectively on the parts of the plant they touch. They are particularly useful for dealing with annual weeds and can provide rapid results by desiccating the plant material they contact.

This focused action is beneficial in situations where quick control is needed, such as in maintenance of ornamental landscapes or in specific spot treatments. Understanding this mechanism helps applicators make informed decisions about when and how to effectively use contact herbicides for the control of unwanted vegetation.