The screw-worm flyChrysomya bezziana villeneuve (Diptera: Calliphoridae) in a sterile insect release trial in Papua New Guinea |
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Authors: | J P Spradbery R S Tozer J M Robb and P Cassells |
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Institution: | (1) Screw-worm Fly Unit, CSIRO Division of Entomology, P.O. Box 6712, Boroko, Papua New Guinea;(2) Present address: CSIRO Division of Entomology, G.P.O. Box 1700, 2601 Canberra, ACT, Australia;(3) Present address: Long Pocket Laboratories, CSIRO Division of Entomology, Private Bag No. 3, 4068 Indooroopilly, Qld., Australia |
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Abstract: | Summary The feasibility of the sterile insect release method (SIRM) was tested against natural populations of the Old World screw-worm
fly,Chrysomya bezziana in the Musa Valley, Papua New Guinea. Sterile mating frequencies were determined from egg masses laid by native females on
wounded, sentinel cattle. The aerial release of sterilised puparia resulted in low frequencies of sterile matings and few
trap recaptures of released material. The release of chilled adult flies resulted in higher frequencies of sterile matings
and many trap recaptures. The mean density of males released was 230 males per km2 per week over a target area of 361 km2 (48% of the valley). Sterile masses were first detected 2 weeks after the release of chill flies commenced, reaching a weekly
peak of 33% after 5 weeks of releases with 15% of egg masses found to be sterile during the final month. The levels of sterile
matings achieved in this trial were similar to comparable SIRM studies made in the USA, Mexico and Guatemala to control the
New World screw-worm fly,Cochliomyia hominivorax. |
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