Effect of natural predators on Queensland fruit fly, Bactrocera tryoni (Froggatt) (Diptera: Tephritidae) control by sterile insect technique (SIT)

Darshana N. Rathnayake*, Elizabeth C. Lowe, Polychronis Rempoulakis, Marie E. Herberstein

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    BACKGROUND: Queensland fruit fly (Q-fly) is a destructive insect pest that infests a wide variety of agricultural plants in Australia. The sterile insect technique (SIT) is used to manage Q-flies, but the effectiveness of SIT has not been tested in the presence of natural predators. The objective of this study was to investigate the effect of natural predators and SIT on the survival and reproduction of laboratory reared Q-flies under semi-natural conditions. We altered the presence of predators and irradiated Q-fly males, and measured survival, number of eggs laid and egg-hatching rate. 

    RESULTS: The presence of natural predators significantly affected the survival of Q-flies and appeared to decrease the number of eggs laid. Interestingly, we found that both sterile and fertile males were more prone to predation than females, but we found no difference among males. The presence of sterile males significantly reduced Q-fly fertility, but the interaction of natural predators and sterile males did not significantly reduce the number of fertile eggs. 

    CONCLUSION: Our findings highlight the important role of natural predators in controlling Q-flies together with SIT and provide a solid foundation for similar large-scale field trials using wild counterparts.

    Original languageEnglish
    Pages (from-to)3356-3362
    Number of pages7
    JournalPest Management Science
    Volume75
    Issue number12
    Early online date8 May 2019
    DOIs
    Publication statusPublished - Dec 2019

    Keywords

    • bio-control
    • fly reproduction
    • pest management
    • predator–prey interaction
    • sterile flies

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