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Plant-Insect Ecosystems

Student Competition 10-Minute Paper

Grad P-IE: Biocontrol 1 On-Demand Presentations

Interactions between spotted-wing drosophila and black soldier fly in fruit wastes

On-Demand
Student Competition On-Demand
We evaluated how the order of establishment affected interactions between  black soldier fly larvae (Hermetia illucens) and spotted-wing drosophila (Drosophila suzukii) in apple pomace.  In experiment one spotted-wing drosophila were added to apple pomace that had black soldier fly larvae added 0, 3 or 7 d previously (plus a no black soldier fly control). In experiment two black soldier fly larvae were added to pomace which had been infested with spotted-wing drosophila 0, 3 or 7 d prior (plus a no black soldier fly control). In experiment one, spotted-wing drosophila offspring were not collected from any of the arenas where black soldier fly larvae were present with a mean of 80 spotted-wing drosophila adults collected from controls. In experiment 2 a mean of 100, 37, 5 and 0 spotted-wing drosophila offspring were collected when black soldier fly larvae were never added, added at 7 days, 3 days and 0 days post spotted-wing drosophila infestation, respectively. Thus, the presence of black soldier fly larvae  in apple pomace greatly reduces the reproductive success of spotted-wing drosophila especially when black soldier fly larvae are added simultaneously with spotted-wing drosophila. Our data suggest that black soldier fly larvae may directly feed on spotted-wing drosophila and/or reduce spotted-wing drosophila oviposition. Next steps are to evaluate the potential of using black soldier for managing spotted-wing drosophila in fruit wastes.