Abstract
Mass rearing and single female rearing of two species of Hirschmanniella were conducted. Adults of H. imamuri penetrated and moved into the roots of rice seedlings in a seed bed and laid their eggs during a comparatively short time. Hatched larvae lived within root cortical layers for some time, and then the matured larvae left the roots and into the soil to become adults. However, attempts to learn the mode of life of H. oryzae was found to be difficult because the morphologycal differences among the larval developmental stages were insufficient for identification of each stage. As results of this study it is considered that one genaration a yeare is commen with H. imamuri, but two generations a year for H. oryzae.
