TABLE CONTENTS

SESSION FORTY-TWO – ROOT-KNOT NEMATODES
CONVENORS: JANETE BRITO & REGINA CARNEIRO
Root-knot Nematode Problems of Greenhouse Crops in Korea
Cho, M.R. & D. Chandrabalan
Bioversity International, Regional Office for Asia, the Pacific and Oceania, PO Box 236, UPM Post Office,
43400 Serdang, Selangor Darul Ehsan, Malaysia
Root-knot nematode (RKN) problems are more severe in horticultural crops under
greenhouse than in open field crops in Korea. The RKN damage is enhanced by consecutive
monoculture for year-round cash crop production. Meloidogyne incognita, M. arenaria, M.
hapla, M. javanica, M. cruciani and M. hispanica are the six species of RKNs reported in
Korea. Recent studies on the RKN distribution in Korea suggested a presence of another
species which showed unknown enzyme phenotypes of malate dehydrogenase and esterase.
Surveys conducted since the 1980’s to date revealed an interesting change in trend of
dominant species in greenhouse soils from M. incognita in 1980’s to M. arenaria in 2000’s.
Another observation is that M. javanica, a tropical species is frequently found in greenhouses
in the temperate area located at 37°N. The major RKN species causing damages in open field
crops, vegetables and medicinal plants is M. hapla. The most serious case of RKN problem is
in the production of fruit vegetables, especially oriental melon under greenhouse conditions.
Oriental melon is one of the most important cash crops in Korea produced year-round under
the forcing culture system. Some greenhouses are consecutively used for over 10 to 20 years,
thus contributing to the high density of RKNs. Due to the short period between harvesting
and planting, it is not feasible to develop an effective RKN management scheme. Various
research approaches are underway to control RKNs; screening of resistant varieties, cultural
methods, and biological control using Pateuria spp. Integrated RKN management strategy is
needed for environment-friendly and sustainable agricultural system.
Root-knot Nematode Species and Diseases in China
Jinling, L., Z. Kan & W. Yanhua
Plant Nematode Lab, College of Environment and Natural Resources, South China Agricultural University,
Guangzhou, PR China 510642
Root-knot nematode is a most important plant parasitic nematode group in China. The species
and diseases caused by the root-knot nematodes are outlined here. As in other countries,
Meloidogyne incognita, M.javanica, M.arenaria and M.hapla are the most common and
important. Some species described are from rice, fruit tree, potato, and forest plants. The
distribution and importance of M.enterolobii are discussed. The root-knot nematode diseases
on vegetable, fruit tree, tobacco and rice are very serious, and management measures include
the application of nematicides, resistance cultivars, agricultural practice and biological
control. (Supported by Ministry of Agriculture in China, Project No. nyhyzx07-050)
5 th International Congress of Nematology, 2008 154