Marigolds (Tagetes sp.) belong to the family Compositae. These plants are known to control a wide range of nematodes including the Meloidogyne (root-knot nematodes) and Pratylenchus. Marigolds can be used as a cover crop or in a crop rotation. When grown as a mono-culture in high density their nematode suppressing effect is highest.
Extracts of marigold are known to be effective repellents against aphids and other insects.
