Cereal cyst nematodes (Heterodera spp.) are a major constraint to cereal production in many parts of the world and contain at least 12 species that invade roots of cereals and grasses.Heterodera avenae (Wollenweber, 1924), H.filipjevi (Madzhidov, 1981), H.latipons (Franklin, 1969) are recognized as the most economically important species in this genera.H.avenae has wide distribution in temperate wheat-producing regions and it was first detected in Turkey in 1974 and is now known to occur in many cereal growing parts in Turkey.