First report of Meloidogyne arenaria infecting Maidong (Ophiopogon japonicus) in China.

Plant Disease
Wentao WuXiahong He

Abstract

Maidong (Ophiopogon japonicus) is a perennial evergreen plant of the Asparagaceae, occurring mainly in China, Japan, Vietnam, and India. It grows in the damp place on the hillside below 2000 meters above sea level, under the forest or beside the stream;It has been widely cultivated in the Sichuan ofhina for medicinal uses; and it is included in the Chinese Pharmacopoeia. During April 2019, Maidong plants exhibiting symptoms of stunting, leaf wilting, and multiple galls in the roots associated with root-knot nematode (Meloidogyne sp.) were detected in a commercial field in near the city of Mianyang (N105°42', E30°93'), Sichuan, China. The second-stage juveniles (J2) were collected from the soil in the root zone, and adult females were dissected from roots. Population densities of J2 ranged from 190 to 255 per 100 cm3. Subsequently, individual females (n=20) were extracted from root samples and submitted to Meloidogyne species identification by perineal pattern morphological analysis (n=20), and morphometric measurements of second stage juveniles (J2) (n = 20). The J2 showed the following morphometric characters:body length = 475.5 ± 24.2 µm, tail length = 55.2 ± 6.43µm, stylet length = 12.4 ± 1.56 µm and distance from dorsal eso...Continue Reading

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