ケナガコナダニの駆除に液体窒素を利用する試み(井上嘉幸博士追悼号)

概要

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The method of using liquid nitrogen to make a limited cryoenvironment to control mite in tatami mat and carpet was attempted. The fatal time of T. putrescentiae in low temperature was five minutes at -30℃ and one minute at -40℃, but the egg was five minutes at -50℃. After sprinkled liquid nitrogen, the temperature on the face and lining of carpet was suddenly falled, and the mites that have been stuck on the carpet ware all killed when the temperature was lower than -40℃. However, the tatami mat have excellent thermal insulation, so that the low temperature which made by liquid nitrogen have not much influence on the inside and back of the tatami mat. The results verify that use of liquid nitrogen is a promising method of control mite for the carpet, but not suitable for the tatami mat.
1995-07-20