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ViewAttendees 21

P-IE

10-Minute Paper

10-min: P-IE, Biocontrol

Parasitism of spotted-wing drosophila by adventive Asian larval parasitoids (Ganaspis brasiliensis, Leptopilina japonica) in northwestern North America: Identifying potential spatiotemporal refuges from parasitism

On-Demand
On-Demand
Two Asian larval parasitoids of the invasive fruit pest spotted wing Drosophila, Drosophila suzukii (Diptera: Drosophilidae) were recently found to have established in British Columbia, Canada.   In 2020, we conducted the first study of the ecology of these two parasitoids, Ganaspis brasiliensis and Leptopilina japonica (Hymenoptera: Figitidae) in their new North American range.  We measured parasitism levels of D. suzukii by these parasitoids across several crop and non-crop host plants at multiple field sites throughout the growing season.  In particular, we asked whether there are still significant refuges from parasitism for D. suzukii, in space and/or time, after having been re-united with two of its natural enemies from its native range. We show that the two parasitoids are well established and abundant in British Columbia and have re-formed a close association with D. suzukii across the diverse array of host plants it attacks over the course of the season in their new geographic range. We discuss the dynamics of parasitism we observed across the season, spatiotemporal refuges from parasitism, and what our results may mean for the parasitoids' potential to contribute to sustainable management of D. suzukii.