Deudorix isocrates is one of the serious pests of Pomegranate, Punica granatum. The present study was undertaken since behavioral understanding of pests has crucial significance in thePest Management. The present study dealt with larval behavior like searching period, selection of site to enter in the fruit, increase in size of entrance hole, selection of sites for pupation and adult behavior with respect to oviposition and fecundity. It was found that rarely the gravid female lays egg on flower, twigs and underside of leaves.The calyx end of fruit is the most preferred site of egg laying (68.65%) than other parts like lower half (11.56%), stalk base (8.31%), upper half (7.49%) and middle region (3.97%) of the fruit. After hatching the most of the neonate larvae (32%) consumed 16 to 30 minutes of period to search suitable site to enter in the fruit. the searching period is ranged between less than 15 minutes (6%) to more than 4 hours (2%) in the rare cases.The lower half of the fruit is the most suitable site for larval entry (57.77%) while the stalk base region of the fruit was rejected for larval entry (0%). The larvae cut the fruit rind to increase dimeter of entrance hole from early to late instar stages. It was found 0.84 mm in first instar, 1.43 mm in second instar, 2.68 mm in third instar and 5.76 mm in forth instar stage of larva. While studying pupation sites it was revealed that the maximum number of larvae (62.60%) pupated inside the fruit, a least number (1.56%) of larvae pupated on the fruit surface. 2.43% of the larvae pupated inside the calyx while 33.39% of the larvae pupated somewhere else.