Observation of unknown Pratylenchus species on Gynura bicolor (Roxb. ex Willd.) DC. in Ishikawa Prefecture, Japan
2016
Uematsu, S. (Ishikawa Agriculture and Forestry Research Center, Agricultural Experiment Station, Kanazawa, Ishikawa (Japan)) | Kanzaki, N. | Mizukubo, T.
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 (36 deg 30 min 55.8 sec N 136 deg 41 min 38.4 sec 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 cultivated field of Okinawan spinach at Kashimimachi, Kanazawa City (36 deg 29 min 20.3 sec N 136 deg 42 min 02.4 sec 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.
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