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Occurrence and Vertical Distribution of Meloidogyne incognita in Chinese Yam (Dioscorea batatas)
Res. Plant Dis. 2019;25:124-130
Published online September 30, 2019
© 2019 The Korean Society of Plant Pathology.

Giyoon Kwon1, Heonil Kang1, Jongmin Seo1, Eulsoo Yun2, Namsook Park2, and Insoo Choi1,2*

1Plant Bioscience, College of Natural Resources and Life Science, Pusan National University, Miryang 50463, Korea
2Nematode Research Center, Life and Industry Convergence Research Institute, Pusan National University, Miryang 50463, Korea
*Tel: +82-55-350-5692
Fax: +82-55-350-5509
Received August 8, 2019; Revised August 27, 2019; Accepted August 29, 2019.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The study was conducted to investigate the infestation and distribution of plant-parasitic nematodes on Chinese yam (Dioscorea batatas) in Andong, Korea. Root-knot nematodes, Meloidogyne incognita was the most prevalent nematode species which is found from 43 yam fields (81.1%) with high population densities (average of 450 juveniles/300 cm3). Other nematodes, root-lesion nematode (Pratylenchus spp.) and pin nematode (Paratylenchus spp.) were less problematic. Density of juveniles (J2) of M. incognita was 10 J2/300 cm3 by August, then increased to 274 in September and 624 in October. The highest J2 density was found at the soil depth between 40 and 50 cm (1,840 J2/300 cm3). M. incognita was able to infest yam tuber down to a depth of 70 cm and developed galls outside and brown spots inside. The highest number of females were found at 40–50 cm (79 females/10 cm piece) tuber from the top.
Keywords : Chinese yam, Dioscorea batatas, Meloidogyne incognita, root-knot nematodes, vertical distribution

September 2019, 25 (3)