Some natural enemies substantially affect host specialization of herbivorous insects. Bactrocera carambolae and B. dorsalis, closely related Tephritidae fruit fly, are serious pests of fruit crops in subtropical-tropical Asia. In Java, Indonesia, they use economically important 4 host fruits (mango, guava, rose apple and starfruit). Despite of the very close phylogenetic relationship and the very wide host range, they use different main host plants in sympatry; B. carambolae and B. dorsalis mainly infest starfruit and mango, respectively. A line of our previous studies revealed that mango was likely the best host in terms of developmental performance of larvae for either species, and that B. dorsalis exerted reproductive interference one-sidedly on B. carambolae. Role of enemy pressures, however, remained unexplored. Here we examined the host-specific parasitoid pressure based on field collected fruits in West Java throughout the year. As a result, the parasitism rate was far larger in starfruit and guava than in rose apple and mango. To estimate an integrated larval performance in each host, we incorporated the host-specific parasitism rate into the host-specific developmental performance of larvae. Consequently, we concluded that mango is the best host for the both species in terms of the integrated larval performance.