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1 June 2014 Evaluating Irradiation Dose for Sterility Induction and Quality Control of Mass-Produced Fruit Fly Bactrocera tryoni (Diptera: Tephritidae)
B. C. Dominiak, S. Sundaralingam, L. Jiang, B. G. Fanson, S. R. Collins, C. Banos, J. B. Davies, P. W. Taylor
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Abstract

The sterile insect technique has been routinely used to eradicate fruit fly Bactrocera tryoni (Froggatt) incursions. This study considers whether fly quality in a mass-rearing facility can be improved by reducing irradiation doses, without sacrificing reproductive sterility. Pupae were exposed to one of five target irradiation dose ranges: 0, 40–45, 50–55, 60–65, and 70–75 Gy. Pupae were then assessed using routine quality control measures: flight ability, sex ratio, longevity under nutritional stress, emergence, and reproductive sterility. Irradiation did not have a significant effect on flight ability or sex ratio tests. Longevity under nutritional stress was significantly increased at 70–75 Gy, but no other doses differed from 0 Gy. Emergence was slightly reduced in the 50–55,60–65, and 70 -75 Gy treatments, but 40–45 Gy treatments did not differ from 0 Gy, though confounding temporal factors complicate interpretation. Reproductive sterility remained acceptable (>99.5%) for all doses—40–45 Gy (99.78%), 50–55 Gy (100%), 60–65 Gy (100%), and 70–75 Gy (99.99%). We recommend that B. tryoni used in sterile insect technique releases be irradiated at a target dose of 50–55 Gy, providing improved quality and undiminished sterility in comparison with the current 70–75 Gy standard while also providing a substantial buffer against risk of under dosing.

© 2014 Entomological Society of America
B. C. Dominiak, S. Sundaralingam, L. Jiang, B. G. Fanson, S. R. Collins, C. Banos, J. B. Davies, and P. W. Taylor "Evaluating Irradiation Dose for Sterility Induction and Quality Control of Mass-Produced Fruit Fly Bactrocera tryoni (Diptera: Tephritidae)," Journal of Economic Entomology 107(3), 1172-1178, (1 June 2014). https://doi.org/10.1603/EC13421
Received: 24 September 2013; Accepted: 1 March 2014; Published: 1 June 2014
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