• biosecurity;
  • screw-worm fly;
  • sentinel;
  • trap


Trapping of Old World screw-worm fly, Chrysomya bezziana Villeneuve (Calliphoridae), using a single sticky trap baited with swormlure was undertaken at 20 locations along the southern coastline of Papua New Guinea bordering the Torres Strait on two occasions in 1981. The traps were operated for 6.5 and 12.5 days, respectively, with total trap catches of 9 male and 95 female screw-worm fly. The mean daily trap catches were 0.23 and 0.30 C. bezziana flies for the two occasions despite nine of the trap locations failing to detect any screw-worm flies. The results of screw-worm fly trapping and/or sentinel cattle studies in several other locations in Papua New Guinea are also presented for comparison, with mean fly trap catches ranging from 0.04 to 0.23 and egg masses from 0.55 to 1.12 per sentinel per day. Comparisons with similar studies in Malaysia indicate that the C. bezziana populations along the Torres Strait border are relatively high with serious biosecurity implications for Australia.