Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Colonization of the imported Torymus (Syntomaspis) sinensis Kamijo (Hymenoptera: Torymidae) parasitic on the chestnut gall wasp (Hymenoptera: Cynipidae). (5) Mortality of Torymus spp. by native facultative hyperparasitoids.

Abstract

Following surveys in an orchard in Japan in 1989-90, several hyperparasitoids (including Eupelmus urozonus and another unidentified Eupelmus sp.) were identified from imported Torymus sinensis. It is suggested that the larval mortality in T. sinensis caused by these hyperparasitoids may be the cause of the failure by the introduced species to control its adopted host, the gall-causing Dryocosmus kuriphilus.