In order to survey for nematodes in Posung tea plantation area, 45 sample sites were investigated. Meloidogyne species was observed at 35 among 45 sites, at the highest percentage 77.8%, Pratylenchus 11.1%, Parathylenchus 6.7% and Helicotylenchus 2.2%. The nematodes species were not identified excepted Pratylenchus fallax and Paratylenchus lepidus because the total samples number of nematodes was very a few. Meloldogyne were revealed higher frequency in the soil of older than of new tea plantation sites but Pratylenchus were observed also in new tea plantations. There are in general high frequency and various sorts of nematodes in old than in new tea plantations. The sorts and density of nematodes were different by the sort of soil for example the higher in clay than in loam. High variation of species and the a number of nematodes were in pH from 4.6 to 5.0 in soil. A number and density of nematodes were coincided with the soil conditions, not only the higher in 0.08~0.1 electro conductivity but in 51~80 g/kg organic contents. The contents of P₂O₅ with from 401 to 800 mg/kg in soil was affected the density and a number of nematodes for example the number of Meloidogyne was observed 18.1, Piatylenchus 5.8. Paratylenchus 37.5 and Helicotylenchus 21.5, while there was no evidenced at under 100 and over 800 mg/kg of P₂O5. The plain area of tea plantation was revealed more sorts and higher number of nematodes than over 15 degree of the planted area gradient. Those results are suggested that the nematodes are distributed prevailing in Korean tea plantation area. In order to conserved the tea plantation filed from the attacks of nematodes, there are more need research studies on the relationship of the density of nematodes and the production of tea leaves, the distributed situation, the identified the nematodes species, and the control methodologry against the nematodes in Korea.
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