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Effect of sublethal doses of gamma radiation on the fecundity, longevity and sterility of adults of Sitotroga cerealella (Olivier) (Lepidoptera, Gelechiidae)

  • I. I. Ismail (a1), A. K. M. El-Nahal (a1), A. H. Kamel (a2) and T. S. Mostafa (a2)

Abstract

Experiments were carried out to study the effect of sublethal doses of gamma radiation (10–100 krad) on fecundity, longevity and sterility of adults of Silotroga cerealella. The results indicate that fecundity of females decreased as the dosage increased from 10–90 krad. At 100 krad no eggs were deposited. Raising the dose to 100 krad resulted in shortening the longevity to about half the longevity of the untreated moths. When irradiated females mated with similarly irradiated males, a dosage of 20 krad caused 97.17% sterility. A dose of 28 krad induced 96.69% sterility when normal females were mated with irradiated males, while 94.14% sterility resulted when normal males were mated with irradiated females.

L'éffet des doses sublétales de la radiation de gamma à taux de 10 jusqu'à 100 Krad sur la fécondité, longivité, et sterilité d'adultes de Sitotroga cerealella a été determiné. Les resultats obtenus ont montré une reduction de la fécondité des femelles suivant l'augmentation de la dose de 10 à 90 Krad. L'application d'une dose correspondant à 100 Krad diminue la fecondité jusqu'à 0.5%. Parrapport aux témoins, la longivité est reduit chez les insectes exposés à 100 Krad. L'accoupplement entre des maies et des femélles egalement traités par 20 Krad resuite 97.17% sterilité chez les femélles. Ce pourcentage se diminue jusqu'à 96,69% à la suite d'un accouplement entre des males traités et des femelles normales. L'irradiation appliquée dans le sens opposé resuite une rediminution de la sterilité jusqu'à 94.14%.

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References

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Brower, J. H. and Tilton, E. W. (1973) Comparative gamma radiation, sensitivity of T. castaneum and T. madens. J. Stored-Prod. Res. 9, 93100.
Calderon, M. and Gonen, M. (1971) Effects of gamma radiation on Ephestia cautella, effects on adults. J. Stored-Prod. Res. 7, 85, 9196.
Cogburn, R. R., Tilton, E. W. and Burkholder, W. E. (1966) Cross effects of gamma radiation on Indian meal moth and the angoumois grain moth. J. econ. Ent. 59, 682685.
Ismail, I. I., El-Nahal, A. K. M., Kamel, A. H. and Mostafa, T. S. (1987) Effect of gamma radiation on the different stages of the angoumois grain moth, Sitotroga cerealella (Olivier). Insect Sci. Applic. (in press).
Pesson, P. (1963) The use of ionising radiation from 60Co for the protection of stored product against injurious pests. Indus. Agric. 60, 211225.

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Effect of sublethal doses of gamma radiation on the fecundity, longevity and sterility of adults of Sitotroga cerealella (Olivier) (Lepidoptera, Gelechiidae)

  • I. I. Ismail (a1), A. K. M. El-Nahal (a1), A. H. Kamel (a2) and T. S. Mostafa (a2)

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