[Investigation on root-knot diseases of medicinal plants in Yunnan]

During 1994-1997, the damage levels about root-knot diseases on 52 medicinal plants were investigated and analyzed. 185 samples were collected from more than 20 counties or cities in Yunnan province. The results showed that 76 specimens were infected by root-knot nematode, which are Meloidogyne incognita (Kofoid and White 1919, Chitwood 1949), M. javanice (Trenb 1855, Chitwood 1949), M. arenaria (Neal 1889, Chitwood 1949) and M. halpa (Chitwood 1949). They infected 21 medicinal plants. The paper describes the damage levels and the distribution about these root-knot diseases of medicinal plants.