Observation of unknown Pratylenchus species on Gynura bicolor (Roxb. ex Willd.) DC. in Ishikawa Prefecture, Japan

Abstract

On February 15, 2015, a stunted rooted cutting of Okinawan spinach or Gynura bicolor (Roxb. ex Willd.) was found in a vinyl house nursery at Suemachi, Kanazawa City, Ishikawa Prefecture (36º30'55.8"N 136º41'38.4"E, 152 m). After visual examination of the damage, nematodes were collected from root samples using a Baermann funnel method and a large number of root-lesion nematodes, Pratylenchus sp., were obtained. The cult ivated f ield of Okinawan spinach at Kashimimachi, Kanazawa City (36º29'20.3"N 136º42'02.4"E, 265 m), where the rooted cuttings were transplanted, was also later revealed to be contaminated by the nematode species. The isolated root-lesion nematode materials were sent to the NARO, Agricultural Research Center, and the species was concluded to be a Pratylenchus species previously unrecorded from Japan. The morphological characters and measurements are given for the species herein.