抄録
In order to determine the relation between the dispersal of Pteromalus puparum (L. ), a pupal parasitoid of Papilio xuthus L., and percentage parasitism by it, releases of the parasitoid were made four times within an area covering a space of 18m by 50m and containing four citrus groves where hosts were placed artificially. After the releases, parasitism percentage markedly increased in the groves where the releases were made, but it was negligible in the other non-released groves. Observations of the released parasitoids on and near the hosts were made two or three times a day for 8 days after one of the releases. From the results of the observations, it is suggested that a large portion of the released parasitoids emigrated from the area soon after the release, but that the rest stayed for more than a week.
