Abstract:Diseases caused by Oil Olive rout-knot nematode are very popularly occurred in Guangxi, Guangdong, Jiangxi and Fujian provinces The specimens identified are collected from Guilin and Liuzhou district of Guangxi province. According to its characters, there are four species of Meloidogyne damaged to Oil Olive. They are Meloidogyne javanica (Trenb, 1885) Chitwood, 1887, Meloidogyne incognita (Koforid & White, 1919) Chitwood, 1949, Meloidogyne arenaria (Neal, 1889) Chitwood, 1949 and Meloidogyne acrita (Chitwood, 1949) Esser, Perry and Taylor, 1976. Among these, M. jaranica and M. incognita are the dominant species.