Cereal cyst nematode (CCN) [1] (syn. cereal root eelworm and oat cyst nematode) is a plant pest caused by Heterodera avenae , Heterodera bifenestra , Heterodera hordecalis , Heterodera latipons , and Heterodera gotland in the following hosts: Avena sativa , Hordeum vulgare , Secale cereale , Triticum aestivum , and × Triticosecale. [2]