The fall webworm, Hyphantria cunea Drury, is an economically important introduced pest in China. A native pupal endoparasitoid, Chouioia cunea Yang (Hymenoptera: Eulophidae, Tetrastichinae) causes considerable mortality of H. cunea pupae in some areas of China. Alternative hosts of C. cunea were tested to find potential substitute hosts for mass rearing the parasitoid. Antheraea pernyi Guerin-Meneville (Lepidoptera: Saturniidae) was chosen as a surrogate host as a single pupa produced an average of 6552 wasps and a maximum of 11,256 per pupa. A mass-rearing technique and successful release program of this parasitoid is described. Parasitism by C. cunea in the areas where it was released averaged 67.74% and was usually over 80%. Other native parasitoids, such as Coccygomimus disparis (Viereck), C. parnasae (Viereck) (Hymenoptera: Ichneumonidae) and Exorita japonica Townes (Diptera: Tachnidae), caused the total average parasitism to exceed 90% on average, reaching a maximum of 96.28% in the release areas. These successful releases indicate that an introduced pest species can also be controlled by the mass-rearing and release of native parasitoids in the country of introduction.

1 Chemical cues involved in host location by Dastarcus helophoroides (Fairmaire) (Coleoptera: Bothrideridae), a parasitoid of Anoplophora glabripennis Motschulsky, Monochamus alternatus Hope, Massicus raddei (Blessig), Apriona germari (Hope), Apriona swainsoni (Hope) and Batocera horsfielde (Hope) in the family Cerambycidae, were investigated in a Y-tube olfactometer. Responses of D. helophoroides adults toward odour sources from their host ( M. raddei ) and host tree ( Quercus mongolicus Fisch. ex. Turcz.) were tested in either no-choice or two-way choice tests. Wood with larval tunnels and larvae frass were attractive to D. helophoroides . Both sexes showed attraction to wood with larval tunnels. 2 Volatile chemicals emitted from wood with larval tunnels and larval frass were collected on Porapak Q and analyzed by gas chromatography-mass spectrometry. Several compounds identified from these sources, including ␣ -pinene, ␤ -pinene, ⌬ -3-carene, limonene and ␤ -myrcene, were tested against D. helophoroides in the same Y-tube olfactometer. 3 The result showed that D. helophoroides adults were attracted to ( R )-( + )-limonene, with or without the background odour from uninfested fresh wood. This may suggest that ( R )-( + )-limonene is an important kairomone for this parasitic beetle. 4 Dose-dependent response of D. helophoroides adults to ( R )-( + )-limonene indicated that D. helophoroides adults showed significant attraction to ( R )-( + )-limonene when release rates exceeded 2.08 g/h in Y-tube olfactometer tests. Moreover, significantly more A. glabripennis larvae were parasitized by D. helophoroides in the presence of R -( + )-limonene, relative to the control in cage experiments.

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