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In recent years, damage by Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) on commercial fruit crops has reached a critical point in Iran. The sterile insect technique is considered the most effective strategy for the area-wide suppression or eradication of tephritid fruit flies, particularly the medfly. In this study, an area of citrus trees, including 39 field cages in Sari-Mazandaran province, was used for an experiment to test various irradiation doses and overflowing ratios on male competitiveness-induced sterility. Treatments 1 and 2 consisted of nonirradiated females (NF), non-irradiated males (NM), and irradiated males (IM) which emerged from pupae irradiated with 80 or 100 Gy. The IM:NM:NF ratios per field cage were varied as follows: 0

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