[Objectives]  Agrilus planipennis Fairmaire is a cryptic and highly destructive wood-boring pest that causes significant damage to Ash trees (Fraxinus pennsylvanica) in the Yanqing district of Beijing. The local forestry protection station has taken various measures to prevent and control this damage, including the use of barrier nets, a new method for protecting trees from A. planipennis. In order to evaluate the effectiveness of barrier nets we compared the damage to Ash trees under different A. planipennis management regimes and compared the costs of these measures. [Methods]  Damage to Ash trees was monitored in three sample plots in Yanqing district employing different A. planipennis control measures from 2017 to 2019. Barrier nets were used to control A. planipennis in Plot 1. Management in Plot 2 consisted of planting other tree species after cutting down seriously damaged ash trees whereas that in Plot 3 was confined to cutting down seriously damaged Ash trees. Damage indices included dieback rate, crown vigor rating, the number of bore holes, the quantity of epicormic branching and the amount of woodpecker activity. The statistical significance of differences in damage indices among the different plots was assessed using Tukey’s test and the average annual control cost per hectare of plot was estimated for each method. [Results]  The survival rate of Ash trees in Plot 1 (100%) was higher than that in Plot 2 (80%) and Plot 3 (34%). Moreover, all damage indices were significantly lower in Plot 1 than in Plot 2 and Plot 3. The annual control cost per unit area for Plot 1 was 2 150 yuan/hm², less than half the cost for Plot 2 (5 625 yuan/hm²) and Plot 3 (5 720 yuan/hm²). [Conclusion]  Using barrier nets to protect Ash trees from A. planipennis is both more effective and significantly cheaper than other methods. We suggest that this kind of integrated pest management be combined with other pollution-free control technologies in the future.