Abstract:In order to control the oriental fruit fly, Bactrocera dorsalis (Hendel), efficaciously, economic thresholds of the oriental fruit fly in carambola orchards were studied. There were significantly correlative among the density of B.dorsalis, damage rate and the loss rate of yield. The more B.dorsalis, the more serious the damage and the yield loss. Four regression equations among the density of this pest, damage rate and the loss rate of yield were established. Four economic thresholds were put forward for carambola in different harvest times according to the densities of B.dorsalis, which were 5.6, 14.0, 19.3 and 8.8 adults per trap, respectively, and the corresponding densities of economic tolerable loss were 10.1, 19.5, 21.7 and 10.4 adults per trap, respectively. Based on the damage rate, the economic thresholds were 5.3%, 8.9%, 6.8% and 7.5%; the corresponding rate of economic tolerable loss were 15.1%, 15.3%, 12.0% and 9.8%, respectively.