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Soil born disease including root knot nematodes (Meloidogyne spp.) caused severe economic loss in Plastic house.This experiment was carried out to control these disease using High Temperature Steam-Sterilizer.High temperature steam (HTS) was pumped up into the under-ground (depth 50cm) through pored plastic pipe (diameter l0cm) in plastic house.Soil temperature was reached over 80℃ after one hour treatment with HTS.