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Radiosensitivity of different larval stage duration pupae of the Mediterranean fruit-fly, Ceratitis capitata Wied

  • Aida M. El-Hakim (a1) and Kamelia A. Abdel-Salam (a1)


The sensitivity of different larval stage duration pupae of Mediterranean fruit-fly, Ceratitis capitata to gamma irradiation, was tested by exposing pupae, 1 day before adult eclosion, to various gamma ray doses (60, 80 and 100 Gy). The treated pupae were biologically different in their larval span (5, 7 and 9 days). The pupae of med-fly having shorter larval period (5 days) were more resistant to sterilizing effects of gamma irradiation than those having longer larval period (9 days). The longevity of sterilized females developing from irradiated pupae, which had 5-and 7-day larval span, was increased considerably. Treatment of pupae which had 5-day larval span with a dose of 80 Gy, resulted in females which lived 84.3 days, but laid only 2.33 eggs as compared with their control females which lived 51.4 days and laid 976.71 eggs. In general, irradiation of pupae of different larval stage duration with a dose of 60 Gy or greater did not adversely affect the longevity of emerging adults. It is concluded that 60 Gy-irradiation of pupae having long larval span (9 days) should be used in the sterile insect release method for population suppression of Ceratitis capitata.

La sensibilite de pupes de la monche Meditereneenne Ceratitis capitata de differentes duréés de stades larveins aux radietions gamme a eté testée en exposant les pupes un jour avent l'eciosion de l'adulte, 3 differents dose de Rayons gamme (60, 80 t 100 Gy) les pupes treites étaient biologiquement différents doses la durée du stade larvaine (5, 7 et 9 joures). Les pupes de la monche Mediteraneenne obéenus issues aprés na plus counte periode larvaine (5 jours) étaient plus resistants aux effects sterilisants des radiation gamma que cells syamt une plus longu un periode larveine (9 jours). La longevité des femelles sterilisés issues de pupes iriadies qui avaient 5 et 7 jours de durée larveine éteient considérablement accune. Le treitement de pupes qui aveient une durée larveine de 5 jours, avec une dose de 80 Gy donineit de femelles vivent 84.3 jours en gamme un déposent qui 2,33 oeuls en royenn pav compereisan avec les femelles traitées qui vivant 51,4 jours et deposent 976,71 oents. En général, l'irradiation des pupes de differents durées due stede larvaine avec une doses de 60 Gy ou plus n'effecten pes au contreir la longévité de adults emergeants.

En conclusion une irradiation de 60 Gy de pupes longue duree (9 jours doit etre utilisen dens une methode de Lêdur de seuches sterile pemr la supperssions de population de Ceratitis capitata.



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