What type of pesticide is specifically designed to eliminate weeds?

Herbicides are specifically designed to target and eliminate weeds, which are unwanted plants that compete with desirable crops or vegetation for nutrients, light, and space. These chemicals work by disrupting specific biological processes in the plant, which can include inhibiting photosynthesis or blocking growth hormones.

Focusing on the context of the other choices, insecticides are formulated to control insect pests, fungicides are aimed at managing fungal diseases, and rodenticides are meant for controlling rodent populations. Each of these types of pesticides is tailored to address specific pest problems and is not effective against weeds, which highlights why herbicides are the appropriate choice for weed elimination.