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Radiosensitivity of eggs of the rice moth, Corcyra cephalonica
Published online by Cambridge University Press: 19 September 2011
Abstract
The sensitivity of 1-day-old eggs of Corcyra cephalonica Staint., to ionizing radiation has been investigated in view of a possible future application of sterile-insect technique to the control of this species. Further, the irradiation effects on subsequent developmental stages were evaluated. A dose of 5 krad prevented hatching of eggs, while a dose of 4 krad was the highest dose that allowed an adequate percentage of the irradiated eggs (28.23) to complete development to the adult stage. While the mating percentage and mating frequency of resultant adults appeared to be unaffected, the percentage of multiple mating was variable and no clear pattern emerged. Egg production and fertility of P1 adults was decreased significantly and all effects of the treatment were more severe for pairings of both sexes resulting from irradiated eggs than pairings of either sex with unirradiated partners. However, the results show that a dose of irradiation low enough to permit adequate numbers of adults to develop from irradiated eggs (4 krad) is insufficient to induce high levels of sterility. Therefore, irradiation of eggs for mass production of either sterile or partially sterile adults was found not to be feasible.
Résumé
La sensibilité de l'oeuf (agé d'un jour) de C. cephalonica contre la radiation ionisée a été etudié en vue de la lutte contre cet insecte par appliquer les maies stériles. L'effet d'irradiation sur les différents stades de développement a été également observé. Une dose de 5 Krad de rayons de Gamma appliqué sur les oeufs a arreté l'eclosion. Par contre, une dose de 4 Krad est considéré comme dose maximale qui permet le développement jusqu'au stade adulte. Le dernier traitement n'a pas eu d'effet sur le pourcentage et la fréquence d'accoupulation chez les adultes, mais l'accoupulation multiple, a été très variée. La production d'oeufs et la fertilité d'adultes ont montré une diminution significative. Cet effet a été plus fort quand l'irradiation est appliquée sur les deux sex accouplés. Les résultats montrent que la dose de 4 Krad, qui permet le développement jusqu'au stade adulte, n'est pas suffisante pour l'induction d'un grand pourcentage de stérilité. Il est a conclure que l'irradiation des oeufs pour la production en masse des adultes complètement ou partiellement stérile est difficilement réalisable.
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- Copyright © ICIPE 1987
References
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