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Background  The Oriental fruit fly,  Bactrocera dorsalis  (Hendel) (Diptera: Tephritidae), is an important polyphagous pest of horticultural produce. The sterile insect technique (SIT) is a proven control method against many insect pests, including fruit flies, under area-wide pest management programs. High quality mass-rearing process and the cost-effective production of sterile target species are important for SIT. Irradiation is reported to cause severe damage to the symbiotic community structure in the mid gut of fruit fly species, impairing SIT success. However, studies have found that target-specific manipulation of insect gut bacteria can positively impact the overall fitness of SIT-specific insects.    Results  Twelve bacterial genera were isolated and identified from  B. dorsalis  eggs, third instars larval gut and adults gut .  The bacterial genera were  Acinetobacter, Alcaligenes, Citrobacter, Pseudomonas, Proteus,  and  Stenotrophomonas,  belonging to the  Enterobacteriaceae  family. Larval diet enrichment with the selected bacterial isolate,  Proteus  sp. was found to improve adult emergence, percentage of male, and survival under stress. However, no significant changes were recorded in  B. dorsalis  egg hatching, pupal yield, pupal weight, duration of the larval stage, or flight ability.    Conclusions  These findings support the hypothesis that gut bacterial isolates can be used in conjunction with SIT. The newly developed gel-based larval diet incorporated with  Proteus  sp. isolates can be used for large-scale mass rearing of  B. dorsalis  in the SIT program.

Potential of a fly gut microbiota incorporated gel-based larval diet for rearing Bactrocera dorsalis (Hendel)