There is a permanent, native population of the exotic pest fruit fly species including Oriental fruit fly (Bactrocera dorsalis), New Guinea fruit fly (Bactrocera trivialis) and melon fly (Bactrocera cucurbitae) in the Western Province of Papua New Guinea immediately adjacent to the Torres Strait islands. Patterns of detection of these fruit flies provide evidence of wind-mediated natural dispersal events into Torres Strait. A permanent network of fruit fly monitoring traps is maintained on every inhabited island and several key uninhabited islands in the Torres Strait (Torres Strait Protected Zone and on the two main islands in the Special Quarantine Zone (see attached map)) Response and eradication measures start immediately following any detection of Bactrocera dorsalis, B. curcubitae, B. trivialis or other exotic fruit fly species. These measures include a combination of bait-spraying of plant foliage throughout the affected communities and enhanced monitoring, including the installation of additional traps on the affected island. Where the number of flies detected exceeds set thresholds, male-annihilation blocking is initiated and response traps are installed on alternative nearby islands. Fruit rearing is also undertaken to monitor for other exotic fruit fly species, including non-lure responsive species. Male annihilation blocks are removed from the island/s 12 weeks after the last detection and response traps are immediately reinstalled for a further 12 weeks on those islands to provide confidence that the incursion has been eradicated.