Globodera vulgaris: a new cyst nematode found on potato in China
From 2018 to 2020, a Globodera species was observed infesting roots of potato (Solanum tuberosum) and surrounding wild plants (Acroglochin persicarioides, Artemisia selengensis, Persicaria nepalensis, Silene sp.) in three provinces of China (Guizhou, Sichuan and Yunnan). No particular symptoms were observed on the aerial parts of these plants. Cysts were collected from the rhizosphere of potatoes and wild plants in 7 locations in Guizhou, Sichuan and Yunnan. These samples were taken to the laboratory for morphological, molecular, and pathogenicity studies. Results showed that collected specimens corresponded to a new nematode species which was called Globodera vulgaris n. sp. Pathogenicity tests showed that G. vulgaris can infest potato, tomato (Solanum lycopersicum), but not tobacco (Nicotiana tabacum). It is noted that the pathogenicity of G. vulgaris on potato is low and similar to that of G. ellingtonae. G. vulgaris is closely related to G. rostochiensis (EPPO A2 List), but presents differences in its morphological characteristics, host range, symptomatology, egg-hatching rate, and molecular characteristics. The authors noted that during their studies, they have not found G. rostochiensis, although this species had recently been reported in potato fields in Guizhou, Sichuan and Yunnan provinces (EPPO RS 2022/204).
Sources
Xu C, Yang S, Xie Y, He J, Chen Y, Pan Y, Xie H (2023) Morphological and molecular characterization, including parasitic and pathogenic studies of a new spherical cyst nematode species, Globodera vulgaris n. sp. (Nematoda: Heteroderidae), associated with potatoes in China. Phytopathology 113(8), 1560-1582.