The study was conducted both in the greenhouse and field from August 2003 to August 2004. Trathala flavoorbitalis is an efficient parasitoid of both Brinjal shoot and fruit borer (BSFB) and Rice leaffolder (RLF) but its parasitism efficiency on BSFB larvae is higher than that of RLF larvae. The highest parasitism rate by T. flavoorbitalis on BSFB larvae in August is 36% & July is 47% and on RLF larvae in November is 26% & Mid March-April is 28%. The parasitism rate of T. flavoorbitalis was always significantly higher in BSFB larvae than that of RLF. The parasitism of BSFB larvae was 1.52 to 2.14 folds higher than that of RLF. In the confined

condition of cage or microplot, when T. flavoorbitalis was given a choice to parasitize BSFB and RLF larvae, they preferred more BSFB larvae