Abstract: This survey was conducted in Gezira State to detect the pink root rot disease of onion, caused by Pyrenochaeta terrestris in Gezira State. The study evolved the isolation, identification of the causal agent of determination of the level of the disease incidence. Three locations within Gezira State were selected namely the vicinity of Almusallamih Tayiba, Wad Al ataya and Hamdalnil and located at North, central and south of the State respectively.