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First host choice, measured as stinging into a host pupa by females from two strains of Trichopria drosophilae that were reared for >30 generations either on D. melanogaster or on D. suzukii. T. drosophilae parasitoids (TD) were reared on either D. melanogaster (DM) or D. suzukii (DS), and were then allowed one passage through either host (DM or DS) in the generation prior to the experiment.
