The relative importance of Reproductive Interference (RI) and Resource Competition (RC) is under debate in competing insect species.  Kuno (1992) mathematically showed that RI overwhelms RC in some conditions. The model is too abstract and cannot grasp behavioral characteristics of RI and RC in natural systems. But experiments with real insects are laborious for detecting the relative importance in evolutionary time scale. Here we used NetLogo, an individual-based model (IBM) capable of implementing individual behaviors, for emulating the competition between two bean weevil species. In the system, larvae complete their development in 20 days, and adults die ten days after their emergence. RC occurs during larval stages, while RI occurs within the adult stage. We ran simulations five times with changing RC and RI intensities for obtaining time-series data of adult dynamics. We analyzed the data with Empirical Dynamic Modeling for reconstructing the causal relationships of RC and RI with the adult population dynamics. The analyses show that the causal relationships concentrated about 21 and 12 days ahead; the former and the latter correspond to the larval RC and the adult RI, respectively. RI showed a time delay as well as RC, which contradicts the previous findings.