Successful management of invasive forest pests with sustainable approaches, such as biological control, is critical to the restoration of the affected or damaged forest ecosystems. Several parasitoids introduced from Northeast Asia were released between 2015 and 2017 in several northeastern states of the USA for biocontrol of the invasive emerald ash borer (EAB), Agrilus planipennis. Using life tables to estimate the pest population growth rate, we evaluated the impact of two introduced parasitoids (Spathius galinae and Tetrastichus planipennisi) on EAB population dynamics in five ash-dominated hardwood forests in three Northeastern U.S states. We observed ~ 76% decrease in average densities of live EAB larvae to a low density (< 7 live larvae per m² of tree phloem) from 2015 to 2020. This reduction in pest density was driven primarily by the significant increase in parasitism rates (from 35 to 78%) by S. galinae, along with low-to-moderate levels of mortality from local generalist natural enemies, such as woodpeckers. Spathius galinae alone caused a 31–57% reduction in the net pest population growth rate from 2018 to 2020. These findings demonstrate that in the recently invaded ash forests in the Northeastern USA, timely introduction of specialized natural enemies, such as S. galinae, along with local generalist natural enemies, may significantly suppress the invasive pest populations to low densities, allowing surviving trees to recover.

通过生物防治等可持续方法成功管理入侵森林害虫对于恢复受影响或受损的森林生态系统至关重要。2015 年至 2017 年间，从东北亚引入的几种寄生蜂在美国东北部的几个州被释放，用于生物防治侵入性翡翠灰蛀虫 (EAB)，Agrilus planipennis。使用生命表来估计害虫种群增长率，我们评估了两种引入的寄生蜂（Spathius galinae和Tetrastichus planipennisi）对美国东北部三个州的五个以灰烬为主的硬木林中 EAB 种群动态的影响。我们观察到活 EAB 幼虫的平均密度降低了约 76% 至低密度（每平方米 < 7 个活幼虫）²树韧皮部）从2015年至2020年这种减少害虫密度，主要是由于寄生率（35〜78％）的显著增加由驱动S. galinae与来自本地通才死亡率低到中等水平，沿天敌，如啄木鸟。白蜡galinae单独导致从2018年的净害虫种群增长率2020年下降31-57％。这些发现表明，在美国东北部最近入侵灰林，适时推出专门的天敌，如S. galinae，与当地通才天敌一起，可以显着地将入侵的害虫种群抑制到低密度，使幸存的树木恢复。