not in Young Alfalfa weevil, Hypera postica, a serious pest of Chinese milk vetch, Astragalus sinicus, in paddy fields, was accidentally established in Miyazaki prefecture in 1986 to 1987. Since 1998, alfalfa weevil has been the target of biological control efforts in this prefecture. Although cocoons of the effective natural enemy, Bathyplecles anurus, were released several times from 1999 to 2006, the parasitoid failed to colonize because of some unfavorable condition. In 2007, a total of 16,000 B. anurus cocoons were released in three alfalfa fields, three communities of bush vetch, Vicia angustifolia, and two Chines milk vetch fields. In spring 2008, considerable numbers of B. anurus cocoons were recorded in Aya Town and Kobayashi City, suggesting successful establishment of the parasitoid in Miyazaki in 2007. We discuss some issues around synchronization of life cycles of H. postica and B. anurus, and the evaluation of percentage para iti m of B. anurus. Hypera postica (Curculionidae): Host; Bathyplectes anurus (Ichneumonidae): Parasite. Japanese none