The mean egg batch size for Bactrocera Malaysian A under field and laboratory conditions was respectively 4.67 ± 0.40 (range 1 - 25) and 4.18 ± 0.26 (range 1-24). More single egg batches were observed in the field (22.0% of the total batches examined) compared to 7.5% in the laboratory. In both cases the mode was at 2 eggs, with batch size of 8 or more eggs fewer in number. It is suggested that such an uneven egg distribution would increase egg survival from parasitism, if the optimal foraging models apply and the egg- parasite oviposits only in high egg batches