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Among Australian endemic tephritid fruit flies, the sibling species  Bactrocera tryoni  and  Bactrocera neohumeralis  have been serious horticultural pests since the introduction of horticulture in the nineteenth century. More recently,  Bactrocera jarvisi  has also been declared a pest in northern Australia. After several decades of genetic research there is now a range of classical and molecular genetic tools that can be used to develop improved Sterile Insect Technique (SIT) strains for control of these pests. Four-way crossing strategies have the potential to overcome the problem of inbreeding in mass-reared strains of  B. tryoni . The ability to produce hybrids between  B. tryoni  and the other two species in the laboratory has proved useful for the development of genetically marked strains. The identification of Y-chromosome markers in  B. jarvisi  means that male and female embryos can be distinguished in any strain that carries a  B. jarvisi  Y chromosome. This has enabled the study of homologues of the sex-determination genes during development of  B jarvisi  and  B. tryoni , which is necessary for the generation of genetic-sexing strains. Germ-line transformation has been established and a draft genome sequence for  B. tryoni  released. Transcriptomes from various species, tissues and developmental stages, to aid in identification of manipulation targets for improving SIT, have been assembled and are in the pipeline. Broad analyses of the microbiome have revealed a metagenome that is highly variable within and across species and defined by the environment. More specific analyses detected  Wolbachia  at low prevalence in the tropics but absent in temperate regions, suggesting a possible role for this endosymbiont in future control strategies.

Australian endemic pest tephritids: genetic, molecular and microbial tools for improved Sterile Insect Technique