(M.F. Purcell, J.c. Herr, essin & TT.Y. Wong. during the first year ofthe test, parasitization of B. dor- salis in common guava, Psidium guajava L. hardly exceeded 6%. However, it is not known whether condi- tions during shipment of parasitized B. dorsalis pupae (Purcell et al., 1994) or errant behavior of adult parasit- oids as they emerged and dispersed from release sites (Messing et al., 1994) may have affected the efficacy of D. longicaudata. Recently, in a study on interspe- cific competition among 3 parasitoids of B. dorsal- is, we observed that females of D. longicaudata were less responsive in parasitizing fruit fly larvae infest- ing papayas (Bautista & Harris, unpubl). Again, the reason why is not understood. We were curious as to whether insectary rear ing may have modified the parasitization behavior of D. longicaudata. Therefore, choice tests were under taken in the laboratory to compare the host seeking and oviposition behavior of female parasitoids between fruit fly larvae that developed in C. papaya and those that developed on wheat diet.