Taxonomical and biological information of ectoparasitoid, Chlorocytus spicatus (Walker) (Hymenoptera: Pteromalidae) introduced to Korea with cabbage seedpod weevil on rapeseed

Abstract Chlorocytus spicatus (Walker) (Hymenoptera: Pteromalidae) is firstly confirmed as a larval ectoparasitoid of the cabbage seed pod weevil (CSPW), Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae) on rapeseed (Brassica napus L., Brassicaceae) in Korea. The parasitism of this ectoparasitoid for the larvae of CSPW maximally showed 12.5% on May 24 in Suncheon, Jeonnam Province and 12.82% on June 12 in Andong, Gyeongbuk Province when the damage rates of pods by CSPW were exceeded 30% respectively. The pupal period of this ectoparasitoid was about 7 days and 6 days in female and male respectively, their females had a lifespan of about 11 days, and the sex ratio was more 4 females to 1 male. In order to aid their identification, we provide a detailed description supplemented by the scanning electron microphotographs of external structures, and also present several biological data of its ectoparasitoid.