Field cage mating experiments of B. dorsalis (Bdor) and B. carambolae (Bcar). Salaya1 and Salaya5 are genetic sexing strains were sterilized by irradiation. Wild flies of B. carambolae originated from Indonesia (Jakarta and Sumatra). The mating test indices PM, RSI, and C are propensity of mating, relative sterile index, and Fried's competitiveness index, respectively. Different letters represent significant differences (α = 0.05) after t-test for equality of means.