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Root-knot symptoms were found on a commercial tomato cultivar carrying Mi, a resistance gene to root-knot nematodes including Meloidogyne incognita, M. arenaria, and M. javanica in 2012 at Buyeo, Chungnam Province in Korea. The isolate was identified as M. incognita based on molecular analyses using two species-specific primer sets. Pathogenicity of the isolate on one susceptible and three resistant tomato cultivars to the root-knot nematodes was tested. The nematode isolate showed strong pathogenicity on all the tested cultivars at all tested incubation temperatures. In addition, resistance degree of 33 commercial tomato cultivars, 8 susceptible and 25 resistant cultivars to root-knot nematodes, was also tested. Plants were determined as resistant when they suppressed the nematode reproduction. All the cultivars demonstrated strong susceptibility to the nematode regardless of resistance of the tomato cultivars. To our knowledge, this is the first report on the occurrence of Mi infecting M. incognita isolate in Korea. On the other hand, to construct an efficient screening method for selecting resistant breeding source to the nematode isolate, root-knot development of M. incognita on four tomato cultivars according to several conditions such as inoculum concentration, plant growth stage, and incubation period after transplant was investigated. Reproduction of the nematode on all the tested cultivars according to inoculum concentration increased in a dose-dependent manner. Except for inoculum concentration, there was no significant difference in reproduction level of the cultivars according to the other tested conditions. On the basis of the results, we suggest an efficient screening method for new resistant tomato to the nematode isolate. Additional key words: breeding, egg mass, resistance, root-knot nematode, species-specific primer *Corresponding author: kjchoi@krict.re.kr ※ Received 21 August 2013; Revised 8 October 2013; Accepted 19 November 2013.      (: 609002-5)    . C 2014 Korean Society for Horticultural Science   (Meloidogyne spp.)         ,               .   , ,   2,000  , Meloidogyne   70        Meloidogyne incognita, M. arenaria, M. javanica  M. hapla  4  (Barham and Winstead, 1957; Choi and Choo, 1978).  M. incognita M. arenaria    ,  M. hapla    Kor. J. Hort. Sci. Technol. 32(2), April 2014 218 (Kim, 2001; Kim et al., 2001; Mitkowski and Abawi, 2003).  1  30-60 ,         ,         (Cho et al., 2000; Kim and Han, 1998).     (Solanum lycopersicum L.)       ,           .    ,  ( ,  ),  (,    ,   )   ( ,  )    (Chon et al., 1996).         ,    , ,               .              (Kim et al., 1998; Oka et al., 2012; Wiratno et al., 2009).               .                  (Kinloch and Hinson, 1972; Rhoades, 1976).                immune ,  reproduction       (egg mass)     (Trudgill, 1991).            Solanum peruvianum    Mi   (Bailey, 1941; Gilbert and McGuire, 1956).  Mi      M. incognita, M. javanica  M. arenaria  , M. hapla   (Barham and Winstead, 1957; Gilbert and McGuire, 1956; Roberts and Thomason, 1986).    Mi        ,       (HR, hypersensitive reaction)   feeding site         (Dropkin, 1969; Ho et al., 1992; Paulson and Webster, 1972).      12    ,         2-3     (Dropkin, 1969; Paulson and Webster, 1972).   Mi  28°C         (Dropkin,

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Occurrence of Meloidogyne incognita Infecting Resistant Cultivars and Development of an Efficient Screening Method for Resistant Tomato to the Mi-virulent -virulent Nematode