Chemical substances for the specific control of nematodes (Roundworms) and other pests living in the ground. They belong to the large group of pesticides, The name is derived from "nematoda" and "caedere" (kill). The most common nematicides consist of organic ones Phosphorus compounds or special hydrocarbons. They have to be distributed well in the soil, so water-soluble agents are used or they are introduced into the earth in the form of fumigation. Some nematicides are also known as insecticides (Insects) and fungicides (Mushrooms) effective. Nematicides are no longer permitted in viticulture.