Effects of Concentrated CO2 on Adult Females and Eggs of Tetranychus urticae (Acari: Tetranychidae) at a High Temperature

Lethal effects of concentrated CO2 at 40 degrees C on adult females and eggs of Tetranychus urticae Koch were examined. No adult female survived after 6-h exposure to 60% CO2, and almost all eggs at different ages died after 6-h treatment with 60% CO2. No marked increase in CO2 tolerance was observed as the egg stage progressed. These results suggest that both adult females and eggs of T. urticae can be controlled with the same CO2 treatment at a high temperature.