The population of both the fruit flies B. dorsalis and B. zonata prevailed throughout the year in mango orchard with their peak activity from 14th SMW to 31st SMW which coincided with the fruiting and harvesting period of fruits. The female of B. zonata laid eggs in clusters of 2 to 14 eggs just underneath the rind of fruit, 1-4 mm deep in the epidermis. The incubation period of eggs was 2.40 0.48 days, whereas the hatching percentage was 82.63 6.94...