Chemical substances for specific control of nematodes (Roundworms) and other ground-dwelling pests. They belong to the big group of pesticides, The name derives from "nematoda" and "caedere" (kill). The most common nematicides are organic Phosphorus compounds or special hydrocarbons. They need to be well distributed in the soil, so they use water-soluble agents or put them in the form of a fumigation in the soil. Nematicides are also known as insecticides (Insects) and fungicides (Fungi) effective. In viticulture nematicides are no longer allowed.