Abstract
Torymus (Syntomaspis) sinensis was recovered in a chestnut grove in Kumamoto Prefecture where it had been released in April 1982. The parasitoid was also detected from an adjacent grove, and had dispersed over more than 30 meters at least within one year from the released tree where it had been released. The percentage of parasitism was estimated to be only 0.4% in the release grove one year after the liberation. Total parasitism by all the parasitoids (the dominant native parasitoid is Torymus (Syntomaspis) beneficus) was 16.1% and 14.2%, respectively in 1983 and 1984. Therefore, the percentage had not increased compared with the value of 15.4% recorded in the year of release. Thus, the effectiveness of the introduced parasitoid remains inconclusive. Eleven native parasitoids were found to attack the chestnut gall wasp, Dryocosmus kuriphilus from the grove where it had been released. Some of them were facultative hyperparasitoids, parasitizing the gall wasp as well as primary parasitoids. The role of these parasitoids in the biological control of the gall wasp remains unknown.
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