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Drosophila suzukii  (the spotted-wing Drosophila) appears to be unsuitable for the development of most Drosophila larval endoparasitoids, be they sympatric or not. Here, we questioned the physiological bases of this widespread failure by characterizing the interactions between  D .  suzukii  and various parasitoid species ( Asobara japonica ,  Leptopilina boulardi ,  Leptopilina heterotoma  and  Leptopilina victoriae ) and comparing them with those observed with  D .  melanogaster , a rather appropriate host. All parasitoids were able to oviposit in L1 and L2 larval stages of both hosts but their propensity to parasitize was higher on  D .  melanogaster .  A .  japonica  and, to a much lesser extent,  L .  heterotoma , were the two species able to successfully develop in  D .  suzukii , the failure of the parasitism resulting either in the parasitoid encapsulation (notably with  L .  heterotoma ) or the host and parasitoid deaths (especially with  L .  boulardi  and  L .  victoriae ). Compared to  D .  melanogaster , encapsulation in  D .  suzukii  was strongly delayed and led, if successful, to the production of much larger capsules in surviving flies and, in the event of failure, to the death of both partners because of an uncontrolled melanization. The results thus revealed a different timing of the immune response to parasitoids in  D .  suzukii  compared to  D .  melanogaster  with a lose-lose outcome for parasitoids (generally unsuccessful development) and hosts (high mortality and possible reduction of the fitness of survivors). Finally, these results might suggest that some European endoparasitoids of Drosophila interact with this pest in the field in an unmeasurable way, since they kill their host without reproductive success.

plos one

Time-course analysis of Drosophila suzukii interaction with endoparasitoid wasps evidences a delayed encapsulation response compared to D. melanogaster