Irradiated (15 and 35 krad) and nonirradiated male codling moths did not differ in their ability to transfer spermatophores when caged with nonirradiated virgin females. However, irradiation significantly reduced the inseminating ability of the treated males as determined by the presence of sperm in the spermathecae of the females. The females inseminated by the irradiated males oviposited significantly fewer eggs than the females inseminated by the nonirradiated males. No differences were found in the quantity of sperm present in the spermathecae. The length of the period of time between irradiation and mating (the post‐irradiation period) did not affect the insemination rate but the percentage egg‐hatch ability did show an increase with the length of this period. Résumé IRRADIATION GAMMA ET INSÉMINATION CHEZ LE CARPOCAPSE LASPEYRESIA POMONBLLA (LEPWOPTERA, OLETHREUTIDAE) Des mâles de Carpocapse irradiés à 15 at 35 krads conservent leur aptitude à transférer des spermatophores à des femelles vierges, mais leur pouvoir fécondant est réduit de faĉon significative, bien qu'on n'observe aucune différence dans la quantiTÉ de sperme présent dans la spermathèque des femelles, par comparaison avec des accouplements avec mâles normaux. Les femelles fécondées par des mâles irradiés déposent moins d'œufs que les femelles TÉmoins. La durée du temps écoulé entre l'irradiation et l'accouplement n'affecte pas le taux de fécundation, mais le pourcentage d'éclosion des œufs s'accroît avec l'allongement de cette période de post‐irradiation.
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