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Host stage preference, efficacy and fecundity of parasitoids attacking Drosophila suzukii in newly invaded areas

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  • Drosophila suzukii (Matsumura) (Diptera: Drosophilidae) causes severe damage to certain fruit crops in both North America and Europe. This may be due, in part, to the absence of specialized natural enemies that suppress population outbreaks. We performed a series of experiments under controlled laboratory conditions in tandem with a field study to evaluate the presence and efficacy of natural enemies associated with this pest in Italian and western United States fruit production regions. Our study involved one larval parasitoid, Leptopilina heterotoma (Thomson) (Hymenoptera: Figitidae), and two pupal parasitoids, Pachycrepoideus vindemiae (Rondani) (Hymenoptera: Pteromalidae) and Trichopria drosophilae (Perkins) (Hymenoptera: Diapriidae). Three indices were used to describe host-parasitoid interactions: degree of infestation (DI), success rate of parasitism (SP) and total encapsulation rate (TER). Results confirmed that each of these parasitoid species can develop on certain populations of the pest. In addition, host stage preferences of the tested parasitoid populations, developmental parameters and lifetime fecundity of North American P. vindemiae are provided. Results are discussed with respect to differences in potential utilization of D. suzukii among the tested parasitoid species and regional populations.
  • Keywords: Leptopilina heterotoma (Hymenoptera: Figitidae), Parasitoid, Trichopria drosophilae (Hymenoptera: Diapriidae), Biological control, Drosophila suzukii (Diptera: Drosophilidae), Pachycrepoideus vindemiae (Hymenoptera: Pteromalidae)
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  • Stacconi, M. V. R., Buffington, M., Daane, K. M., Dalton, D. T., Grassi, A., Kaçar, G., ... & Anfora, G. (2015). Host stage preference, efficacy and fecundity of parasitoids attacking Drosophila suzukii in newly invaded areas. Biological Control, 84, 28-35. doi:10.1016/j.biocontrol.2015.02.003
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  • 84
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  • We thank the California Cherry Board for the financial support of part of this study in California. Dr. Gülay Kaçar was supported as a visiting scholar by the Scientific and Technological Research Council of Turkey (TUBITAK). Funding for research in Oregon, U.S.A. was provided from the USDA-NIFA award # 2010-51181-21167 and in Italy was partly funded by the Autonomous Province of Trento (Italy), Research funds for Grandi Progetti, Project LExEM (Laboratory of excellence for epidemiology and modeling.
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